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##What are the requirements for a planet to orbit around the sun at twice the Earth's rate?

##Would it rotate at twice the rate?

##Would a planet that close to the sun be habitable?

##Would a planet rotating that quickly be habitable?

What are the requirements for a planet to orbit around the sun at twice the Earth's rate?

Would it rotate at twice the rate?

Would a planet that close to the sun be habitable?

Would a planet rotating that quickly be habitable?

While the rate of a planet's revolution is determined by its proximity to the star, its rate of rotation is almost entirely arbitrary. Tidal force between two bodies acting over a sufficiently long period of time can cause tidal locking, although no known planets are tidally locked with their star.

While the rate of a planet's revolution is determined by its proximity to the star, its rate of rotation is almost entirely arbitrary. Tidal force between two bodies acting over a sufficiently long period of time can cause tidal locking, although no known planets are synchronously tidally locked with their star.

In fact, in 1609, based on new measurements of our own solar system, Johannes Kepler figured out some general rules. Kepler's third law of planetary motion states that the cube of a planet's semi-major axis (that is, the distance from the sun) is proportional to the square of its orbital period (year). So to get a body to orbit twice as quickly requires it to be about a hird closer: I calculate that for a planet to revolve every 180 days you'd want it to be 0.62 AU from the sun.

In fact, in 1609, based on new measurements of our own solar system, Johannes Kepler figured out some general rules. Kepler's third law of planetary motion states that the cube of a planet's semi-major axis (that is, the distance from the sun) is proportional to the square of its orbital period (year). So to get a body to orbit twice as quickly requires it to be about a third closer: I calculate that for a planet to revolve every 180 days you'd want it to be about 0.62 AU from the sun.