Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
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
Summer on Uranus lasts for 21 years.
358
Jupiter is bigger than all the other planets combined.
254
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
41% of the moon is not visible from earth at any time.
103
Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second.
100
Astronomer Percival Lowell believed that he was the first person to observe canals on Venus, but because of a faulty adjustment of the eyepiece on his telescope, he was in fact looking at the blood vessels in his own eye.
4