How long is a day/year on Mars?

The farther a planet is from the sun, the longer it takes to make a full orbit (1 year). But each planet also rotates on its axis at different speeds, resulting in a shorter or longer day length. The two speeds are not necessarily related.

The earth rotates once every 24 hours, which is one day. But on Mercury, a day lasts almost 59 Earth days. And a year on Mercury lasts only 88 days. So if you were 8 years old on Earth, you would be 33 years old on Mercury.

Venus rotates much more slowly than earth, but travels around the sun faster. A day on Venus takes 243 Earth days. A year on Venus only takes 224.7 Earth days. If you were 8 years old on Earth you would be 13 years old on Venus.

Mars rotates on its axis about the same speed as Earth – each day on Mars takes 1.03 Earth days (24.6 hours). But a year on Mars takes much longer – 687 Earth days. If you were 8 years old on Earth you would be only 4 years old on Mars.

Each day on Jupiter takes only 9.8 Earth hours. But it takes 11.86 Earth years for Jupiter to orbit the sun once. If you were 8 years old on Earth you would be barely 8 months old on Jupiter.

One day on Saturn only takes 10.2 Earth hours since it spins more than twice as fast as earth. It takes 29.46 Earth years for Saturn to orbit the sun once. If you were 8 years old on Earth you would be barely 3 months old on Saturn.

Each day on Uranus takes 17.9 Earth hours. It takes 84.07 Earth years for Uranus to orbit the sun once. If you were 8 years old on Earth you would be barely 1 month old on Saturn.

Each day on Neptune takes 19.1 Earth hours. It takes almost 165 Earth years for Neptune to orbit the sun once. If you were 8 years old on Earth you would be barely 2 weeks old on Saturn. (Or, if you were one year old on Saturn you would be 165 years old on Earth.)

Pluto spins slowly. Each day on Pluto takes 6.39 Earth days. It takes 247.7 Earth years for Pluto to orbit the Sun once. If you were 8 years old on Earth you would be 12 days old on Pluto. (Or, if you were one year old on Pluto you would be 248 years old on Earth.)

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