Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
Earth is the only planet in our solar system that's not named after a god or goddess.
17