In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
Astronauts cannot burp in space.
232
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
A comet's tail always points away from the sun.
2
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178