What is the criteria for something in space to be a planet?

Updated: 4/28/2022
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A planet, as defined by the International Astronomical Union (IAU), is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighboring region of planetesimals.

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Q: What is the criteria for something in space to be a planet?
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Why the criteria of the Pluto do not match with other planets?

If by this question you mean why Pluto is no longer an official planet, it's because it is not the dominant object in its region of space.

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I believe that you should were a space suit, or something to protect you from all the heat in the atmosphere.

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