Which of the following orbits is a possible orbit for a planet?

$A$ planet has an orbital radius twice that of the Earth's orbital radius. The time period of the planet is .......... $years$.

Draw the areal velocity versus time graph for Mars.

The motion of satellites in the solar system is an example of which of the following?

In a solar system, the time-period of revolution of a planet tracing a circular orbit of radius $R$ is proportional to :

$A$ planet revolves around the sun whose mean distance is $1.588$ times the mean distance between the earth and the sun. The revolution time of the planet will be ........... $years$.