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[|How do black holes form?] Black holes form when gravity calapses on a star.Black holes also form when gravity calapses on galaxies.Black holes also form when a star explodes.Black holes also form when massive stars become supernova. they form when an object of three solar masses collapse its own gravity.

How do stars form? Stars start out in big clouds of gasoline and dust.Then these particals begin to crash into each other.Then the particals start to cluster together.Also as the particallse crash it makes heat. And that is how a star forms.

Why is'nt pluto a planet anymore? As we all know pluto is a dwarf planet.Its not that pluto was purposly removed from our solar system but the IAU out lined a new definition of what describes a planet.Pluto didnt meet the discription to be a planet.So that is why pluto is not a planet anymore.