An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
131
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
There are two golf balls sitting on the moon.
721
A comet's tail always points away from the sun.
2