dr-becky 1 month ago
astrophysicist #Space and Time

How do we know how much dark matter there is in the Universe?

I often get asked how do we know dark matter exists? Which is why I've made a video on all the observational evidence we have before.

But occasionally I'll get asked how do we know how much dark matter there is, which is a really fun question.


There's many different ways we can calculate this, including the ratio between normal (baryonic) and dark matter, but in this video I just wanted to highlight three different ways astrophysicists calculate this. 

Dr Becky Smethurst
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