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| gravitational pull |
Any space vehicle must move at a rate of 7 miles per second in order to escape the earth's gravitational pull.
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| lightning bolt |
A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
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| meteorids |
More than 20 million meteoroids enter Earth's atmosphere every day.
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| Jupiter's moon Ganymede |
Jupiter's moon Ganymede, is larger than the planet Mercury!
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| astronauts in space |
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
Astronauts cannot burp in space.
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