Jupiter's moon Ganymede, is larger than the planet Mercury!
149
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
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A 100-pound person on Earth would weigh 38 pounds on Mars.
102
There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
124
The moon is actually moving away from Earth at a rate of 1.5 inches per year.
236
The earth travels through space at 660,000 miles per hour.
189
A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
5