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What causes a day on any planet?

In: Planetary Science [Edit categories]

Answer:

the sun or a star

Contributor:

Masmune

First answer by Masmune. Last edit by Masmune. Contributor trust: 17 [recommend contributor ]. Question popularity: 1 [recommend question].

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What causes a day on a planet?
A day is defined as the time it take a planet to revolve once on it's axis. So it is the time it takes for a planet to "spin" once.
What causes a year on any planet?
On any planet, one year is defined by one orbit, or revolution, around its sun. One day is defined by the complete rotation spun around its own axis. The actual length of a year on a planet depends...
What determines the length of a day on any planet?
An apparent day length results in combination of the period of rotation, or the planets spin speed, combined with the orbital period of the planet around the sun.
Will Earth ever mix into another planet any day?
It is possible, but not for a long long long long long long long long time.
Are there any planets with the same length of a day as earth?
The closest planet to Earth in terms of rotation period is Mars with a period of 24 hours 37 minutes 23 seconds. The second closest is Neptune at 16 hours.