An astronomer discovered a new planet rotating on its axis and revolving around a star. He discovered that the star was about the same size as the sun. He studied the planet and discovered the following.
• Average distance from the star: 145 million km
• Time to orbit the star: 256 days
• Time of rotation on axis: 10 hours
• Axis of rotation: Perpendicular to the plane of its orbit
• Water: Strong possibility of presence of water
Compare the planet with the earth on the following points.
1. Length of an year
2. Length of 1 day and 1 night
3. Seasons
4.Whether there is possibility of life

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Solution

1. Length of the year on any planet is calculated by the time taken by the planet to orbit a sun. Here, time taken by the planet to orbit a sun-like star is given 256 days. Hence, the length of the year on the planet would be 256 days.

2. Length of one day and one night is decided by the time taken by the planet to rotate on its own axis. The given planet takes 10 hours to rotate on its axis. Hence, the length of one day and one night on the given planet is 10 hours long.

3. As the axis of rotation of the planet is perpendicular to the plane of the orbit, hence there would be no seasons on the given planet.

4. There is a strong possibility of the presence of water on the planet, so there are some chances that life is possible on the given planet.

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