How do Satellites orbit the earth?

Have you ever wondered how satellites orbit the earth?  Just how do they stay up there?  It’s the same reason that the earth does not fly off into space.  Satellites orbit the earth, just as the earth orbits the sun.  It all has to do with gravity, and we have Isaac Newton to thank for the discovery of gravitational attraction. Newton published the law of gravitation in 1687.  This law basically says that everything in the universe is attracted to...

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Re-entry into Earth’s atmosphere

In the last couple of days, I have been doing a bit of research on re-entry into the Earth’s atmosphere. Meteorites burn up when they fall into the Earth’s atmosphere, this basically has to do with the sheer size of the meteorite and kinetic energy, you know, because the large meteorite is going incredibly fast. So when a meteorite enters the Earth’s atmosphere, most of the heat is due to the air that the meteorite runs into. In a sense,...

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