Listener Questions 41: Questions about the mass of the Universe, moons made of gas, and backyard blackholes.
Daniel and Kelly’s Extraordinary Universe
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How to Measure the Mass of Stars
In general we can tell the mass of stars by looking at how bright they are. There's still big unanswered questions about what's going on at the heart of star. Even in our solar system the mass of things that are not the sun is about 1%. We can measure the mass of some planets around other stars because we can see their size as they eclipse their star and so that tells us their density etcetc.
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