HR Diagram, a scatter plot of stars showing the relationship between luminosity and surface temperature, luminosity, the star brightness resulting from the energy emitted from the star over a period of time, spectral class, the classification of stars based on the elements they absorb and their surface temperature, main sequence star, a narrow band of stars on the HR diagram that fuse hydrogen into helium in their core, red giant, very old star that has begun to die and has depleted their hydrogen supply, white dwarf, very small dense star with a collapsed core in the final stage of a low mass star, supernova, a large explosion that takes place at the end of a massive star's life cycle., nebula, a giant cloud of dust and gas in space, protostar, a very young star that is still gathering mass and forming from stellar nebula, star life cycle, the process by which a star changes over time with its lifetime being dependent on its mass, gravity, the force that creates the pressure to fuse atoms, which makes the stars shine, the Sun, a yellow dwarf star classified as a G-type main-sequence star with a surface temperature

Astronomy Terms

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