The heart of an astronaut actually gets smaller when in outer space.
216
Some asteroids have other asteroids orbiting them.
131
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
More than 20 million meteoroids enter Earth's atmosphere every day.
139
Only 55% of Americans know that the sun is a star.
986
Jupiter is bigger than all the other planets combined.
254
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
Astronomer Percival Lowell believed that he was the first person to observe canals on Venus, but because of a faulty adjustment of the eyepiece on his telescope, he was in fact looking at the blood vessels in his own eye.
4