Mars

Mars is the fourth planet from the Sun. It is also the second nearest planet to the Earth and will probably be the first planet visited by humans. It has an orbital period equal to 687 Earth days and a rotational period equal to 24hrs 37mins and 22.6 seconds. Therefore there are 668 Martian days in a Martian Year. Mars has a very eccentric orbit that can vary from 249 million km to 207 million km. As a result, it also experiences seasons.