Sound doesn't travel in space.
255
If you were to cry in space, the tears would form a bubble in your eye until it's so big it moves to another spot on your face.
10
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
Summer on Uranus lasts for 21 years.
358
Mars had an oxygen-rich atmosphere around 4 billion years ago
13