In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
The heart of an astronaut actually gets smaller when in outer space.
216
Buzz Aldrin’s mother’s maiden name was Moon.
9
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
Summer on Uranus lasts for 21 years.
358
Mars had an oxygen-rich atmosphere around 4 billion years ago
13