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A collection of gas and dust, that forms, new stars, or is the result of a dying star
The entire range of electromagnetic waves from low frequency to high frequency
That plate starts temperature and brightness can also tell your spectral class and color of star
A sphere of matter with a destiny of temperature great enough to cause a nuclear reaction at its center
A huge system of millions or billions of stars together with gas and dust, all held together by gravity
Galaxy
Star
Nebula
HR diagram
Electromagnetic spectrum