Sentences with phrase «undergo nuclear fusion»

Another crucial debate topic: Are there points of light in a fixed firmament, or are there balls of gas undergoing nuclear fusion grouped into galaxies in an expanding universe.
The class D (for Degenerate) is the modern classification used for white dwarfs — low - mass stars that are no longer undergoing nuclear fusion and have shrunk to planetary size, slowly cooling down.
«A planet is a sub-stellar mass body that has never undergone nuclear fusion and that has sufficient self - gravitation to assume a spheroidal shape adequately described by a triaxial ellipsoid regardless of its orbital parameters,» the proposal said.
«In the process of undergoing these nuclear fusion reactions, the sun emits large amounts of heat and light.
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