In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
Summer on Uranus lasts for 21 years.
358
The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
13
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
A comet's tail always points away from the sun.
2
If you went out into space, you would explode before you suffocated because there's no air pressure.
149
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
Astronauts cannot burp in space.
232