Only 55% of Americans know that the sun is a star.
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The earth travels through space at 660,000 miles per hour.
189
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
More than 20 million meteoroids enter Earth's atmosphere every day.
139
Lightning strikes about 6,000 times per minute on this planet!
158
On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
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