Consider the following pairs:
Objects in space Description
1. Cepheids : Giant clouds of dust and gas in sapce
2. Nebulae : Stars which brighten and dim periodically
3. Pulsars : Neutron stars that are formed when massive stars run out of fuel and collapse
How many of the above pairs are correctly matched?
Answer:
(a)
The correct answer is (a).st1 is wrong. Cepheid variable stars are just stars which are visible to us from the earth that are many times larger than the sun itself. st2 is wrong. Nebulae: A nebula is a giant cloud of dust and gas in space. st3 right. Pulsars are neutron stars that are formed when massive stars run out of fuel and collapse. The collapse of the star’s core creates a very strong magnetic field, which causes the neutron star to emit beams of radiation.