A comet's tail always points away from the sun.
2
Summer on Uranus lasts for 21 years.
358
Jupiter has radio storms so strong that they can be picked up and heard by an AM radio.
16
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
Pluto is smaller than Russia.
9
An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
9
More than 20 million meteoroids enter Earth's atmosphere every day.
139