If we see a star at a large distance from the center of the galaxy, that star is going to be mostly moving either away from the center or back toward the center. Almost certainly, most of its motion is perpendicular to our line of sight.
If we see a star at a large distance from the center of the galaxy, that star is going to be mostly moving either away from the center or back toward the center. Almost certainly, most of its motion is perpendicular to our line of sight.
Massive dark matter halos are clearly detected in disk galaxies, so where did they disappear to during the mergers
© 2020 Inspirational Stories
© 2020 Inspirational Stories