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Subject: Science and Technology

  • A path to global connectivity

    Context

    As terrestrial 5G mobile networks are being rolled out across countries, there is a renewed interest in integrating Non-Terrestrial Networks.

    SatNets for 5G

    • Satellites and terrestrial networks have always been considered two independent ecosystems, and their standardisation efforts have proceeded independent of each other.
    • The primary non-terrestrial network that is being considered is the low latency Low Earth Orbit (LEO) satellite networks (SatNets), as a complement to terrestrial networks.
    • Towards this, Starlink, operated by the Elon Musk-owned SpaceX, and OneWeb, promoted by Bharti Global, have launched about 2,500 and 648 LEO satellites respectively at an altitude of about 1,200 km with the objective of promoting global broadband connectivity.
    • There are other players such as Reliance Jio in a joint venture with Luxembourg-based SES and Amazon’s Project Kuiper.

    Benefits of using SatNets

    • 1] Service continuity in emergency: service continuity to provide seamless transition between terrestrial networks and SatNets in case of public safety, disaster management and emergency situations;
    • 2] Providing service in remote area: Service ubiquity to provide 5G services in unserved and underserved areas of the world, thereby bridging the digital divide;
    • 3] Scalability: Service scalability that utilises the unique capabilities of SatNets in multicasting and broadcasting similar content over a large geographical area.
    • 4] Service to in-motion user: The LEO SatNets can provide service not only to stationary but also to in-motion users.
    • 5] Low latency over long distance: Wireless communications through LEO satellites over long distances is proven to be 1.47 times faster than communication over the same distance through terrestrial optic fibre. It is this advantage along with global coverage that provide a strong use case for LEO SatNets to complement terrestrial optic fibre networks.
    • SatNet in standardisation: In view of the above advantages, standard-setting organisations such as the Third Generation Partnership project (3GPP), comprising telcos and equipment manufacturers around the world, started integrating SatNets in the standardisation process.

    Measures by the government

    • Realising the advantages, the Government, in its National Digital Communications Policy 2018, has indicated the development of an ecosystem for local manufacturing of satellite communication systems and promoting participation of private players for the strengthening of satellite communication infrastructure in the country.
    • Accordingly, the New Space India Limited (NSIL), a public sector enterprise, was established in 2019 to re-orient space activities from a ‘supply driven’ model to a ‘demand driven’ model, thereby ensuring optimum utilisation of the space assets.
    • The Department of Space also established in 2020 a new regulatory body named the Indian National Space Promotion and Authorisation Centre (IN-SPACe).
    • IN-SPACe is intended to provide a level playing field for private companies to use Indian space infrastructure.

    Issues and challenges

    • Allocation of frequency: Issues will involve addressing issues around frequencies to be allocated for satellite broadband, the methodology of allocation, the relatively higher cost of consumer equipment and the placement and interconnections of SatNets with terrestrial public landline/ mobile networks at the ground stations
    • Cost: The other major challenge in LEO SatNets is the cost of user terminal and access charges to the end users.
    • A recent research analysing both Starlink and OneWeb concludes that the standalone LEO SatNets have a distinct cost advantage only if the density is less than 0.1 person per square km compared to terrestrial broadband networks.
    • Hence it is to the advantage of LEO SatNet providers to integrate their networks with terrestrial 5G networks to improve the cost economies.

    Conclusion

    All these, along with the proposed revisions to the Satellite Communications Policy of the Government, will provide the required fillip to LEO SatNets to become an integral part of the communication infrastructure of the country.

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    Back2Basics: LEO satellites

    • LEO satellites orbit between 2,000 and 200 kilometers above the earth. LEO satellites are commonly used for communications, military reconnaissance, spying and other imaging applications.
    • A low earth orbit (LEO) satellite is an object, generally a piece of electronic equipment, that circles around the earth at lower altitudes than geosynchronous satellites.
    • Satellites made for communications benefit from the lower signal propagation delay to LEO.
    • This lower propagation delay results in less latency.
    • Being closer to the earth has an obvious benefit for many types of earth observational satellites by resolving smaller subjects with greater detail.

  • Russia to leave International Space Station (ISS)

    Russia will pull out of the International Space Station (ISS) after 2024 and focus on building its own orbiting outpost.

    Why in news?

    • Russia will end a symbolic two-decade orbital partnership between Moscow and the west.

    International Space Station (ISS)

    • The ISS was launched in 1998 as part of joint efforts by the U.S., Russia, Japan, Canada and Europe.
    • The idea of a space station originated in the 1984 State of the Union address by former U.S. President Ronald Reagan.
    • The space station was assembled over many years, and it operates in low-earth orbit.
    • Since its inception, it has served as a laboratory suspended in space and has aided multiple scientific and technological developments.
    • The ISS was originally built to operate for 15 years.

    Why was ISS launched?

    • A space station permits quantum leaps in research in science, communications, and in metals and lifesaving medicines which could be manufactured only in space.
    • ISS has consistently maintained human presence for the past 21 years, providing astronauts with sophisticated technologies for scientific research.

    What is Russia’s role in maintaining the ISS?

    • The ISS is built with the cooperation of scientists from five international space agencies — NASA of the U.S., Roscosmos of Russia, JAXA of Japan, Canadian Space Agency and the European Space Agency.
    • Each agency has a role to play and a share in the upkeep of the ISS.
    • Both in terms of expense and effort, it is not a feat that a single country can support.
    • Russia’s part in the collaboration is the module responsible for making course corrections to the orbit of the ISS.
    • They also ferry astronauts to the ISS from the Earth and back.
    • Until SpaceX’s dragon spacecraft came into the picture the Russian spacecraft was the only way of reaching the ISS and returning.

     

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  • Private Sector Boost in India’s Space Industry

    Principal Scientific Adviser stated earlier this month that the government would soon come up with a new space policy that could initiate the rise of India’s own “SpaceX-like Ventures”.

    Prospects of the proposed Space Policy

    • The final version of the policy would soon be referred to the Empowered Technology Group for further examination.
    • The proposed move would increase private sector participation in the industry.
    • The policy document recognizes that India has not tapped into its complete potential in space sector.

    Why is development in the space sector important?

    Ans. Address wide range of problems

    (1) Climate Change

    • Satellites provide more accurate information on weather forecasts and assess (and record) long-term trends in the climate and habitability of a region.
    • By monitoring the long-term impact of climate change at regional, territorial, and national scales, governments would be able to devise more pragmatic and combative plans of action for farmers and dependent industries.
    • Additionally, they can also serve as real-time monitoring and early-warning solutions against natural disasters such as earthquakes, tsunamis, floods, wildfires, mining etc.
    • Real-time tracking can also serve multiple purposes in defence.

    (2)  Connectivity

    • In this light, it must be noted that satellite communications, which are used to facilitate telecommunication services, are among the major categories for investment in the space technology sector.
    • Satellite communication can reach more remote areas where conventional networks would require a heavy complimenting infrastructure.
    • Additionally, as to reliability, the World Economic Forum had stated that satellite communication can help connect 49% of the world’s unconnected population.
    • Other prominent categories include spacecraft and equipment manufacturing.
    • What essentially needs to be remembered is that the strategic space avenue is an integration of the aerospace, IT hardware and telecom sectors.

    Where does India stand in the global space market?

    • As per SpaceTech Analytics, India is the sixth-largest player in the industry internationally having 3.6% of the world’s space-tech companies (as of 2021).
    • US holds the leader’s spot housing 56.4% of all companies in the space-tech ecosystem.
    • Other major players include UK (6.5%), Canada (5.3%), China (4.7%) and Germany (4.1%).
    • The Indian Space Industry was valued at $7 billion in 2019 and aspires to grow to $50 billion by 2024.

    Why does India matter in the global space-tech market?

    • The country’s standout feature is its cost-effectiveness.
    • India holds the distinction of being the first country to have reached the Mars’ orbit in its first attempt and at $75 million — way cheaper than Western standards.

    Future prospects of India’s private ‘Space’

    Ans. India may lead in space junk management

    • Almost 60-odd start-ups had registered with the Indian Space Research Organisation (ISRO) this year.
    • A majority of them were dealing in projects related to space debris management.
    • As space becomes more congested with satellites, the technology would thus help in managing ‘space junk’ (debris of old spacecraft and satellites).

    Where does India lack?

    Ans. Undisputedly, it is the finances

    • The US and Canada were the highest receivers of space-related investment in 2021.
    • The US’s space budget was $41 billion in 2021, $23.3 billion of which was focused on NASA.
    • India’s total budgetary allocation for FY2022-23 towards the Department of Space was â‚č13,700 crore ($172 million).
    • Further, as per Tracxn data, funding into the sector’s start-ups (in India) nearly tripled to $67.2 million on a year-over-year basis in 2021.

    How is the private sector’s involvement regulated in India?

    • In June 2020, the Union government announced reforms in the space sector enabling more private players to provide end-to-end services.
    • The central idea was to bring forth a predictable policy and regulatory environment for them and additionally provide access to ISRO facilities and assets to improve their capacities.

    (1) Establishment of IN-SPACe

    • An announcement for the establishment of the Indian National Space Promotion and Authorisation Centre (IN-SPACe) was made.
    • It was mandated the task of promoting, authorising and licensing private players to carry out space activities.
    • As an oversight and regulatory body, it is responsible for devising mechanisms to offer sharing of technology, expertise, and facilities free of cost to promote non-government private entities (NGPEs).
    • IN-SPACe’s Monitoring and Promotion Directorate oversees NGPE’s activities as per prescribed regulations and reports back in case any corrective actions or resolutions are required.
    • ISRO shares its expertise in matters pertaining to quality and reliability protocols, documentation, and testing procedure through IN-SPACe’s ‘interface mechanism’.

    (2) Establishment of NSIL

    • Additionally, constituted in March 2019, New Space India Ltd (NSIL), is mandated to transfer the matured technologies developed by the ISRO to Indian industries.
    • All of them are under the purview of the Ministry of Defence.
    • Private sector’s involvement in the long term, as with other commercial sectors, is believed to help spur investment and expertise in the realm which is capital-intensive and demands high technology.

     

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  • A new global standard for AI ethics

    Context

    Artificial intelligence (AI) is more present in our lives than ever. From predicting what we want to see as we scroll through social media to helping us understand weather patterns to manage agriculture, AI is ubiquitous.

    Issues with AI  and it why it matters to India

    • Bias and discrimination: The data used to feed into AI often aren’t representative of the diversity of our societies, producing outcomes that can be said to be biased or discriminatory.
    • Errors in facial recognition: There are problems emerging in facial recognition technologies, which are used to access our phones, bank accounts and apartments, and are increasingly employed by law-enforcement authorities, in identifying women and darker-skinned people.
    • For three such programs released by major technology companies, the error rate was 1% for light-skinned men, but 19% for dark-skinned men, and up to 35% for dark-skinned women.
    • Biases in facial recognition technologies have led to wrongful arrests.
    •  Indeed, if the business model of how these technologies are developed does not change to place human interests first, inequalities will grow to a magnitude never before experienced in history; access to the raw material that is data is key.
    • These issues are of particular importance to India, which is one of the world’s largest markets for AI-related technologies, valued at over $7.8 billion in 2021.
    •  The National Strategy on Artificial Intelligence released by NITI Aayog in 2018 highlights the massive potential of AI in solving complex social challenges faced by Indian citizens across areas such as agriculture, health, and education, in addition to the significant economic returns that AI-related technologies are already creating.

    UNESCO agreement

    • To ensure that the full potential of these technologies is reached, the right incentives for ethical AI governance need to be established in national and sub-national policy.
    • India has made great strides in the development of responsible and ethical AI governance, starting with NITI Aayog’s #AIForAll campaign to the many corporate strategies that have been adopted to ensure that AI is developed with common, humanistic values at its core.
    • UNESCO’s recommendations: Last November 193 countries reached a groundbreaking agreement at UNESCO on how AI should be designed and used by governments and tech companies.
    • UNESCO’s Recommendation on the Ethics of Artificial Intelligence took two years to put together and involved thousands of online consultations with people from a diverse range of social groups.
    •  It aims to fundamentally shift the balance of power between people, and the businesses and governments developing AI.
    • Countries which are members of UNESCO have agreed to implement this recommendation by enacting actions to regulate the entire AI system life cycle, ranging from research, design and development to deployment and use.
    • This means they must use affirmative action to make sure that women and minority groups are fairly represented on AI design teams.
    • The Recommendation also underscores the importance of the proper management of data, privacy and access to information.
    •  It establishes the need to keep control over data in the hands of users, allowing them to access and delete information as needed.
    • It also calls on member states to ensure that appropriate safeguards schemes are devised for the processing of sensitive data and effective accountability, and redress mechanisms are provided in the event of harm.
    • Socio-cultural impact: The broader socio-cultural impacts of AI-related technologies are also addressed, with the Recommendation taking a strong stance that-
    • 1] AI systems should not be used for social scoring or mass surveillance purposes;
    • 2] That particular attention must be paid to the psychological and cognitive impact that these systems can have on children and young people;
    • 3] Member states should invest in and promote not only digital, media and information literacy skills, but also socio-emotional and AI ethics skills to strengthen critical thinking and competencies in the digital era.
    • In a number of countries, the principles of the Recommendation are already being used in AI regulation and policy.
    • Finland provides an example of good practice of this regard, with its 2017 AI Strategy.

    Conclusion

    The new agreement is broad and ambitious. It is a recognition that AI-related technologies cannot continue to operate without a common rulebook. Over the coming months and years, the Recommendation will serve as a compass to guide governments and companies, to voluntarily develop and deploy AI technologies that conform with the commonly agreed principles it establishes.

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  • Indian Antarctic Bill, 2022

    The Lok Sabha deferred the consideration and passing of the Indian Antarctic Bill, 2022 as the Opposition benches were empty due to the ongoing protests outside of Parliament.

    Indian Antarctic Bill, 2022

    Aims and objectives:

    • To provide for national measures to protect the Antarctic environment and associated ecosystems and to give effect to the Antarctic Treaty
    • To provide a harmonious policy framework for India’s Antarctic activities through a well-established legal mechanism
    • Facilitate activities of the Indian Antarctic programme, including management of Antarctic tourism and sustainable development of fisheries
    • To prohibit carrying of certain activities without a permit or the written authorisation of another party to the protocol
    • To provide for inspection in India by an officer designated by the Central government as an Inspector and to constitute an inspection team to carry out inspections in Antarctica
    • To prohibit drilling, dredging, excavation or collection of mineral resources or even doing anything to identify where such mineral deposits occur.

    Key feature: Committee on Antarctic governance

    • It will empower the government to establish a committee on Antarctic governance and environmental protection to monitor, implement and ensure compliance with the relevant international laws, emissions standards and rules of protection.
    • The panel is to be headed by the secretary of the Ministry of Earth Sciences, as ex officio chairperson.
    • Among other roles, he/she has also been the vice-president of the Scientific Committee on Antarctic Research of the International Science Council since 2018.
    • The committee will have ten members from various ministries, departments and organizations of the Union government, plus two experts on the Antarctic environment or other relevant areas.

    Prohibited activities

    The Bill prohibits certain activities in Antarctica including:

    • Nuclear explosion or disposal of radioactive wastes,
    • Introduction of non-sterile soil, and
    • Discharge of garbage, plastic or other substance into the sea which is harmful to the marine environment

    About Antarctica Treaty

    • Antarctica has a geographical area of 14 million sq. km and has had no indigenous population (i.e. “Antarcticans” don’t exist).
    • However, a few thousand people reside there, in some 40 research stations spread across the continent, throughout the year.
    • In 1959, 12 countries – Argentina, Australia, Belgium, Chile, France, Japan, New Zealand, Norway, South Africa, the USSR, the UK and the US signed the Antarctic Treaty.
    • Their aim was to prevent the continent from being militarised and to establish it as a center of peaceful activities.
    • Later, more countries, including India, have become party to the treaty, and today it counts more than 54 members.

    Significance of the treaty

    • The treaty requires each party to take appropriate measures within its competence, including the adoption of laws and regulations, administrative actions, and enforcement measures, to ensure compliance with the protocol.
    • Countries also signed the ‘Protocol on Environmental Protection to the Antarctic Treaty in 1991, which designates Antarctica as a “natural reserve, devoted to peace and science”.

    Need for the Antarctic Legislation

    • The growing presence of Indian scientists in Antarctica and the commitment to Antarctic research and protection prompted the government to adopt domestic legislation consistent with its obligations as a member of the Antarctic Treaty system.
    • These laws will enable India’s courts to deal with disputes or crimes committed in parts of Antarctica, and help build credibility vis-Ă -vis India’s participation.

     

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  • Karnataka tops India Innovation Index List

    Karnataka has bagged the top rank in NITI Aayog’s India Innovation Index, 2022, which determines innovation capacities and ecosystems at the sub-national level.

    India Innovation Index (III)

    • The release of the second edition of the index—the first was launched in October 2019—demonstrates the Government’s continued commitment to transforming the country into an innovation-driven economy.
    • The index attempts to create an extensive framework for the continual evaluation of the innovation environment of all states and UTs in India.
    • It intends to perform the following three functions-
    1. Ranking of states and UTs based on their index scores
    2. Recognizing opportunities and challenges, and
    3. Assisting in tailoring governmental policies to foster innovation
    • The states have been bifurcated into three categories: major states, northeast and hill states, and union territories/city-states/small states.

    Significance

    • The study examines the innovation ecosystem of Indian states and union territories.
    • The aim is to create a holistic tool that can be used by policymakers across the country to identify the challenges to be addressed and strengths to build on when designing policies.

    Highlights of the 2022 index

    • Karnataka has held this position, under the Major States category, in all three editions of the Index so far.
    • It was followed by Telangana, Haryana, Maharashtra and Tamil Nadu. Chhattisgarh, Odisha, Bihar and Gujarat were at the bottom of the index.
    • In the Index, Manipur secured the lead in the Northeast and Hill States category, while Chandigarh was the top performer in the Union Territories and City States category.

     

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  • EU’s Markets in Crypto-Assets (MiCA) Law

    The Markets in Crypto-Assets (MiCA) law of European Parliament is the first comprehensive regulation for cryptos, and some expect it to become a trendsetter for crypto regulation globally.

    What is MiCA Legislation?

    • The MiCA law seeks to address concerns like money-laundering, protection of consumers and investors, accountability of crypto firms, stablecoins and the environmental footprint of crypto mining.
    • It would regulate the “wild west” of crypto assets and provide legal certainty for those issuing crypto assets, while ensuring high standards for investors and consumers.
    • It also excludes non-fungible tokens, but the EU may make a horizontal legislation for NFTs in 18 months, after a separate assessment.

    How will MiCA regulate stablecoins?

    • The efficacy of stablecoins, which claim to be less volatile that other cryptos, came into question after the crash of some crypto-currencies.
    • The MiCA would mandate that stablecoin issuers maintain minimum liquidity to provide for sudden large withdrawals by users, and the reserves must also be protected from insolvency.
    • The European Banking Authority (EBA) has been brought in to supervise stablecoins, and the law asks stablecoin issuers to provide claims to investors free of charge.
    • In addition, large coins which are used as a means of payment will be capped at €200 million worth of transactions per day.

    How will the new law regulate money laundering?

    • MiCA requires the EBA to maintain a public register of non-compliant crypto asset service providers (CASPs).
    • Additional checks will be required, in line with the EU Anti-Money-Laundering (AML) framework.

    How does it address green concerns?

    • Under MiCA, crypto companies will be required to declare their environmental and climate footprint.
    • The European Securities and Markets Authority will develop regulatory technical standards on methodologies, content and presentation of such information.
    • The EC will also have to provide a report on the impact of crypto assets on environment.
    • It would introduce mandatory minimum sustainability standards for mining mechanisms, especially the proof-of-work system which raises overall computing power.

    Will it affect Indian regulations?

    • India’s crypto regulations seem to have taken a back seat at the moment.
    • Industry executives and experts say the government and industry are more concerned about taxation.
    • India levied a 30% tax on income from transfer of cryptos from April, and added a 1% tax deduction at source from 1 July.
    • This, along with the overall bear market, has depressed trading volumes, and revenues of crypto exchanges.
    • Indian regulators are also expected to consider rules being developed in the US before taking concrete decisions.

    Back2Basics: Stablecoins

    • Stablecoins are cryptocurrencies where the price is designed to be pegged to a cryptocurrency, fiat money, or to exchange-traded commodities (such as precious metals or industrial metals).
    • Advantages of asset-backed cryptocurrencies are that coins are stabilized by assets that fluctuate outside of the cryptocurrency space, that is, the underlying asset is not correlated, reducing financial risk.
    • Bitcoin and altcoins are highly correlated, so that cryptocurrency holders cannot escape widespread price falls without exiting the market or taking refuge in asset backed stablecoins.
    • Furthermore, such coins, assuming they are managed in good faith, and have a mechanism for redeeming the asset(s) backing them, are unlikely to drop below the value of the underlying physical asset, due to arbitrage.

     

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  • What are Fast Radio Bursts (FRB)?

    A strange radio signal (called Fast Radio Bursts) has been detected in a galaxy several billion light-years from Earth, a recent study claimed.

    What is an FRB?

    • The first FRB was discovered in 2007, since when scientists have been working towards finding the source of their origin.
    • Essentially, FRBs are bright bursts of radio waves (radio waves can be produced by astronomical objects with changing magnetic fields).
    • Its durations lie in the millisecond scale, because of which it is difficult to detect them and determine their position in the sky.

    Who discovered it?

    • The X-ray portion of the simultaneous bursts was detected by several satellites, including NASA’s Wind mission.
    • Further, a NASA-funded project called Survey for Transient Astronomical Radio Emission 2 (STARE2) also detected the radio burst.

    Why are they significant?

    • First noticed in 2018 by the Canadian observatory the waves have created ripples across the globe for one reason — they arrive in a pattern.
    • This gave birth to theories that they could be from an alien civilization.
    • Initially, it was believed that the collision of black holes or neutron stars triggers them.
    • But the discovery of repeating FRBs debunked the theory of colliding objects.

     

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  • James Webb Space Telescope

    NASA has unveiled images from the James Webb Space Telescope, the largest and most powerful orbital observatory ever launched.

    What is the image about?

    • NASA released a deep field photo of a distant galaxy cluster, SMACS 0723, revealing the most detailed glimpse of the early universe recorded to date.
    • The collection also included fresh images of another galaxy cluster known as Stephan’s Quintet, first discovered in 1877.

    James Webb Space Telescope

    • JWST is a joint NASA–ESA–CSA space telescope that is planned to succeed the Hubble Space Telescope as NASA’s flagship astrophysics mission
    • It is the most powerful space telescope ever built.
    • It will enable a broad range of investigations across the fields of astronomy and cosmology, including observing some of the most distant events and objects in the universe,
    • It would help understand events such as the formation of the first galaxies, and detailed atmospheric characterization of potentially habitable exoplanets.

    Its significance

    • Some have called JSWT the “telescope that ate astronomy.”
    • It is said to look back in time to the Dark Ages of the universe.

    What does the ‘Dark Ages’ of the universe mean?

    • Evidence shows that the universe started with an event called the Big Bang 13.8 billion years ago, which left it in an ultra-hot, ultra-dense state.
    • The universe immediately began expanding and cooling after the Big Bang.
    • One second after the Big Bang, the universe was a hundred trillion miles across with an average temperature of an incredible 18 billion F (10 billion C).
    • Around 400,000 years after the Big Bang, the universe was 10 million light-years across and the temperature had cooled to 5,500 F (3,000 C).
    • Throughout this time, space was filled with a smooth soup of high-energy particles, radiation, hydrogen and helium.
    • There was no structure. As the expanding universe became bigger and colder, the soup thinned out and everything faded to black.

    This was the start of what astronomers call the Dark Ages of the universe.

    How will JWST study this?

    Ans. Looking for the first light

    • The Dark Ages ended when gravity formed the first stars and galaxies that eventually began to emit the first light.
    • Astronomers aim to study this fascinating and important era of the universe, but detecting first light is incredibly challenging.
    • Compared to massive, bright galaxies of today, the first objects were very small and due to the constant expansion of the universe, they’re now tens of billions of light years away from Earth.
    • Also, the earliest stars were surrounded by gas left over from their formation and this gas acted like fog that absorbed most of the light.
    • It took several hundred million years for radiation to blast away the fog. This early light is very faint by the time it gets to Earth.

     

     

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  • Three new ‘exotic’ sub-atomic particles discovered  

    The Large Hadron Collider beauty (LHCb) experiment has observed three never-before-seen particles.

    What is the discovery?

    • CERN was investigating the slight differences between matter and antimatter by studying a type of particle called the “beauty quark”, or “b quark”.
    • The three “exotic” additions — a new kind of “pentaquark” and the first-ever pair of “tetraquarks” — to the growing list of new hadrons were found.
    • This discovery will help physicists better understand how quarks bind together into these composite particles.

    What are Quarks?

    • Quarks are elementary particles that come in six “flavours”: up, down, charm, strange, top, and bottom.
    • They usually combine together in groups of twos and threes to form hadrons such as the protons and neutrons that make up atomic nuclei.
    • But they can also combine into four-quark and five-quark particles, called tetraquarks and pentaquarks.
    • These exotic hadrons were predicted by theorists about six decades ago — around the same time as conventional hadrons — but they have been observed by LHCb and other experiments only in the past 20 years.

    What about tetraquarks and pentaquarks?

    • Most exotic hadrons discovered in the past two decades are tetraquarks or pentaquarks.
    • They contain a charm quark and a charm antiquark — with the remaining two or three quarks being an up, down or strange quark or their antiquarks.

     

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