The population of the Earth has more than doubled since 1950.
151
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
The earth rotates more slowly on its axis in March than in September.
145
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
The heart of an astronaut actually gets smaller when in outer space.
216
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
