Doppler red shifts and blue shifts of light from the stars in the galaxies.
The evidence for the existence of dark matter in the universe includes the extra mass of Galactic clusters discovered by Fritz Zwicky, and the spinning galaxies which rotate at the same speed as discovered by Vera Rubin.
unknown
yes they do
Obviously. All galaxies must rotate - otherwise, they would collapse due to their own gravity.
No. If a galaxy were not to rotate, it would soon collapse upon itself, due to its own gravitation.
You can't prove a negative with direct evidence.
There aren't really any other names for a galaxy that I can think of, but there are galaxy classifications, such as spiral galaxies (that can rotate either clockwise or counter-clockwise), elliptical galaxies, and irregular galaxies.
None of them. The best evidence is the redshift.
The best way to prove employee dishonesty is by keeping a record of evidence that may prove your view. Without evidence or a witness, it may be difficult to prove it.
Edwin Hubble.
Wherever you look, galaxies and galaxy clusters are observed to have much more mass than the sum of the known matter (stars, dust, gas, black holes). Galaxies rotate too fast for the known amount of matter, galaxies in a galaxy cluster move too fast, and gravitational lensing indicates a larger mass than the known masses.Wherever you look, galaxies and galaxy clusters are observed to have much more mass than the sum of the known matter (stars, dust, gas, black holes). Galaxies rotate too fast for the known amount of matter, galaxies in a galaxy cluster move too fast, and gravitational lensing indicates a larger mass than the known masses.Wherever you look, galaxies and galaxy clusters are observed to have much more mass than the sum of the known matter (stars, dust, gas, black holes). Galaxies rotate too fast for the known amount of matter, galaxies in a galaxy cluster move too fast, and gravitational lensing indicates a larger mass than the known masses.Wherever you look, galaxies and galaxy clusters are observed to have much more mass than the sum of the known matter (stars, dust, gas, black holes). Galaxies rotate too fast for the known amount of matter, galaxies in a galaxy cluster move too fast, and gravitational lensing indicates a larger mass than the known masses.
Falsehood is to deceive as evidence is to prove. Prove is a word that is commonlyÊ used in law courts.