I’m still skeptical about Dark Matter and Dark Energy.
Galaxies rotate at a different speed than predicted by our theories of gravity. Therefore, 95% of the universe must be invisible, odorless, tasteless, and undetectable, in order to keep our theories inviolate.
The alternative to Dark Matter is MOND, Modified Newtonian Dynamics, which assumes that maybe gravity works a little different than we’ve discovered so far, when it acts over great distances. MOND can explain many of the galactic rotational discrepancies. Dark Matter is equivalent to saying the planets move because angels are pushing them.
Dark Energy is the explanation for discrepancies between the distance to far galaxies, and the Doppler shift toward the red in their spectra, which is interpreted as their speed away from us. Our measurements of such distances are based on a wobbly stack of assumptions. Rather than question the assumptions, it’s much easier to, again, invoke an invisible undetectable Something that explains the observations.