They don't expand. There just leftover from the explosion of the universe.
yes
The answer to this is we do not know but it looks unlikely.The expansion of the universe appears to be speeding up. Local Galaxies might merge into larger galaxies but these galaxies will expand faster and faster away from each other.
Because galaxies don't expand. The universe expands. Think of galaxies as little spots on a balloon. When you blow it up the surface gets larger not the little spots, but the spots do get further apart. Gravity creates the extreme flatness that you observe. Moments after the big bang the initial structure of the universe was set, that applies to the size of the galaxies as well. The only observable difference is the galaxies were a lot closer to each other in the beginning. Gravity then took over and started effecting the closest galaxies by pulling them closer together. The galaxies face a battle between the expanding universe and the gravity of other galaxies.
It's just called the expanding universe.
who discovered the galaxies who discovered the galaxies
Spiral galaxies, barred spiral galaxies, elliptical galaxies, and irregular galaxies
The possessive form for the plural noun galaxies is galaxies'.Example: Their galaxies' paths do not coordinate.
Some key theories about galaxies include the hierarchical model, which suggests they form through mergers of smaller galaxies; the cold dark matter model, which posits that dark matter plays a significant role in galaxy formation; and the disk instability theory, proposing that galactic disks can spawn new stars through gravitational instabilities.
The Orion galaxy is not getting wider. Galaxies are huge collections of stars, gas, and dust held together by gravity and don't expand in the same way the universe does. The distance between galaxies is increasing due to the expansion of the universe, but individual galaxies like Orion remain the same size.
Elliptical galaxies are sometime called dwarf galaxies.
15 Galaxies? There are over 1,000,000,000 galaxies possibly more.
no galaxies are not harmful