Cosmological redshift
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The cosmological redshift is an effect of light from distant galaxies coming to the Earth with the redshift roughly proportional to the distance between those galaxies and the Earth.
It looks either as if time at those galaxies run slower than on the Earth (for the Einsteinian coupling between time dilation and the curvature of space)
or
the galaxies were moving away from each other (which then would mean that the universe were expanding with speed of about 70km/s/Mpc (the number called in astronomy the "Hubble constant").
The consensus of astronomers assumed the latter case dispite it requires spooky creation of matter from nothing, not present in the former case which complies with physics of gravitation demystified.