Halo 18 (IMAGE)
Caption
Halo 18 is an example of a galaxy that had a head-on collision (see the panel at z=1.2) and had a disc flip (you can see this by comparing the disc orientation at z=1.4 and z=0). This image and Image 2 show how these two exemplary galaxies evolve with time: each panel corresponds to a different time defined by redshift (z). Redshift is a quantity used by astronomers to measure the time in the universe, with z=0 corresponding to the present day, and larger z corresponding to earlier times. Each z has two panels associated with it, which show how the galaxy looks in two planes (like the xy and xz planes in 3D space).
Credit
Auriga Project
Usage Restrictions
Use with credit.
License
Original content