this post was submitted on 21 Jul 2025
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Light from stars tells us how big they are then adjust for things that don't emit light by looking at how objects move (i.e. gravity). Objects in this case not necessarily being single entities but often groups of things like entire galaxies. This is basically how dark matter became a thing. Scientists were like "hey theres waaaay more gravity moving things around but we dont see any objects causing it...."