A color pie chart showing the energy budget of the Universe in three categories: Dark Energy, Dark Matter, and everything else. The dark energy contribution looks like pac-man.

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1. Robert McNees (mcnees@mastodon.social)'s status on Sunday, 23-Jul-2023 20:19:45 UTC Robert McNees

   in reply to

   The case for dark matter is very strong and extends beyond galactic rotation curves. Dynamics of galaxy clusters, gravitational lensing, the existence of especially old galaxies, and cosmological models all support the existence of dark matter.

   Dark matter seems to make up about 27% of the universe! This is perhaps surprising, since the matter we are familiar with – the baryons and fermions of the Standard Model of particle physics – is less than about 5% of what's out there.