Cosmology Views

Dark Matter Evidence

Physicist Sabine Hossfelder posted on YouTube an interview titled:

How good is the evidence for Dark Energy?

link

my comment
Redshifts are mentioned several times, including the M31 anomaly.
The Doppler effect is observed with the light source in motion.
A galaxy has millions of stars with independent motion so a galaxy redshift requires a different interpretation.

This mistake with galaxy redshifts was noted by Hubble in the 1930's but never fixed.
The correct Doppler effect usage  is explained here:

link