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 gets 100 tons heavier every day due to falling space dust.
673
The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
The earth travels through space at 660,000 miles per hour.
189
Not only are there rogue planets floating through space completely alone, not orbiting any stars, but it’s possible that these pitch-black lonely planets support life.
14
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
Sound doesn't travel in space.
255
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9