About half the stars in the sky are multiple stars. They are fun to observe, particularly the ones with a wide range of temperatures which results in different colors. They are also very important scientifically as they are the only way we can measure the mass of the stars. Some doubles, as they go through their evolutionary process, result in type 1a supernovae which we use to measure the scale of the cosmos, with the significant discovery being the acceleration of the expansion.
Speaker: Gary Kader
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