Small fragments of orbiting bodies that have landed on Earth are known as meteorites. If the fragments are still orbiting earth are known as meteoroids. They are not called meteorites until they enter Earth's atmosphere. Once a meteor enters Earth's atmosphere it will begin to burn up. It may burn up completely or lose most of its size by the time is lands on Earth's surface.
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no i don't know the answer
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Today, one second is defined as “9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom”. That's a mouthful.
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b. amount of energy available as fuel for the body
