Subject_Meat5314 t1_j14bmjh wrote
Reply to comment by djamp42 in Antimatter from space can travel thousands of light years to Earth, a promising development in the search for dark matter by marketrent
The only reason we need dark matter to exist is to explain the things we can see. For galaxies to work they way they work, given current understanding of how gravity works, they need more mass. That mass has to be somewhere in the galaxy. And there are plenty, as in trillions, of galaxies that are entirely contained in what we call the observable universe.
pressedbread t1_j17wvx1 wrote
>And there are plenty, as in trillions, of galaxies that are entirely contained in what we call the observable universe.
Might not be that much. It seems like a lot because billions or trillions is a large number, but it might be a lot bigger
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