There are two golf balls sitting on the moon.
721
A comet's tail always points away from the sun.
2
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
There's a mysterious dwarf planet between Mars and Jupiter called 'Ceres' which has never been visited by spacecraft or photographed in detail, however, Earth-bound telescopes reveal a large bright shining spot on the surface of this planet, the origin and nature of which are unknown.
5
41% of the moon is not visible from earth at any time.
103
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160