Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
A comet's tail always points away from the sun.
2
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
5
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115