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| a contracting mass of gas that represents an early stage in the formation of a star |
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| Process of two Hydrogen atoms joining together to make Helium as fuel for the star. |
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| a series of star types to which most stars belong. |
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| a very large star of high luminosity and low surface temperature |
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| formed when a low-mass star has exhausted all its central nuclear fuel and lost its outer layers as a planetary nebula. A small very dense star that is typically the size of a planet. |
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| a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass. |
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| thought to form by the gravitational collapse of the remnant of a massive star after a supernova explosion, provided that the star is insufficiently massive to produce a black hole. |
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| a region of space having a gravitational field so intense that no matter or radiation can escape. |
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| the intrinsic brightness of a celestial object |
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| a two-dimensional graph, in which the absolute magnitudes of stars are plotted against their spectral types. |
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