Jupiter's moon Ganymede, is larger than the planet Mercury!
149
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
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Some asteroids have other asteroids orbiting them.
131
A comet's tail always points away from the sun.
2
The earth travels through space at 660,000 miles per hour.
189
The heart of an astronaut actually gets smaller when in outer space.
216
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
Venus is the only planet that rotates clockwise.
310