The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
121
A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
127
The heart of an astronaut actually gets smaller when in outer space.
216
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221