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Why the meteors burn in space if there is no oxygen present there?
Meteors don't burn in the space, rather it burns when it enters into the Earth's or any other planets atmosphere.
The rocky or metallic debris, significantly smaller than asteroids and contain less water and ice than comets, found in outer space, it is known as Meteoroids. They travel through outer space, and some directed to Earth sometime. Most meteoroids are fragments of comets or asteroids.
When these meteoroids come close enough to Earth somehow and enter into the Earth's atmosphere, then it is known as meteors or "shooting stars" because as soon as it enters the Earth's atmosphere, it begins to break and burn due to friction, and often leaves a temporary streak of light behind them in the direction they are travelling.
Some meteoroids that are large enough to crash down to Earth even after burning in the Earth's atmosphere are commonly known as meteorites.
The term Meteoroids, Meteors and Meteorites, all indicate the one thing, but the difference between them is all about their locations.
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