All galaxies contain hot blue stars...
The smallest galaxy - a dwarf galaxy - will contain stars upwards of 30 billion stars. You are thinking of an open cluster, which as the name suggests, is a cluster of stars, not a galaxy. An open cluster is a group of up to a few thousand stars.
A galaxy!
There are 400 billion stars in our galaxy - we can't name them all.
A galaxy. Ours is the milky way, which is a barrel galaxy. Answer- I think they are actually called star clusters. Galaxies contain much more than just stars. They contain stellar remnants, dust and gas, planets, and many other astronomical features.
No galaxy by that name exists.
galaxy
If they form a galaxy, it's called a galaxy of course.
Yes. Amsonia hubrichtii is the scientific name of a blue star. Blue stars are part of the Main Sequence stars.
A spiral galaxy, as its name implies, has one or more spiral arms that stretch out from the center. The center often contains a bulge of stars and sometimes can even contain an active black hole.
the word super massive stars is the category name for the biggest stars in the galaxy
constellation
It seems extremely likely that all galaxies contain solar systems. All galaxies contain stars - that's part of the definition of a galaxy. And according to recent observations, it is quite common for stars to have planets, so such a star would qualify as a "solar system".