# How long is a year on other planets?

Note4Students

From UPSC perspective, the following things are important :

Prelims level: Revolution of Earth and other planets around the Sun

Mains level: NA

For us, 365 days make up a year because Earth takes as many days to complete one orbit of the Sun. But have you ever wondered how many days make up a year on other planets?

#### What determines the length of a year?

• The length of a year on any planet depends on where the planet is orbiting.
• Planets that are closer to the Sun than Earth will have fewer days in a year, while those rotating farther away will take many more days to make up a year.
• This is because of two reasons – planets that are closer to the Sun will take a shorter time to orbit it than those farther away, and the closer a planet orbits the Sun, the Sun’s gravity can pull on the planet, making the planet orbit faster.

#### Why should we care?

• To send a spacecraft to another planet, we need to know where the planet is in orbit.
• This will help us plan and manoeuvre the spacecraft accordingly.

#### How long each planet takes to orbit the Sun (in Earth days):

• Mercury: 88 days
• Venus: 225 days
• Earth: 365 days
• Mars: 687 days
• Jupiter: 4,333 days
• Saturn: 10,759 days
• Uranus: 30,687 days
• Neptune: 60,190 days

#### It’s a mean task to consider this PYQ from 2013, Huh!

Q.Which planet was downgraded to dwarf planet status?

(a) Pluto

(b) Mars

(c) Earth

(d) Venus

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