A cluster is a group of stars that may contain hundreds of thousands of stars. Clusters can be classified into two main types: globular clusters, which are densely packed and contain thousands to millions of stars, and open clusters, which are looser and contain tens to hundreds of stars.
They (scientists) think there are hundreds of thousands of galaxies because the universe is limitless so there may be billions of galaxies!
The observable Universe has at least a hundred billion galaxies. The galaxies closest to us are part of the so-called "Local Group" (that is, the group that includes our galaxy); this Local Group includes our own galaxy (i.e., the Milky Way), the Andromeda Galaxy, the Triangulum Galaxy, and about 50 dwarf galaxies such as the Large Magellanic Cloud and the Small Magellanic Cloud. Then, of course, there are hundreds or thousands of galaxies "near-by" as distances between galaxies go, but outside of our Local Group.
Smaller galaxies do. Larger galaxies contain billions or even trillions of stars.
Galaxies contain stars and nebulae, as well as a large variety of other phenomena.
The local group of galaxies that include our Milky Way is called the "Local Group".The local group of galaxies that include our Milky Way is called the "Local Group".The local group of galaxies that include our Milky Way is called the "Local Group".The local group of galaxies that include our Milky Way is called the "Local Group".
Yes. Our local group of galaxies is made up of 3 larger galaxies (milky-way, Andromeda and M33) and several smaller or dwarf galaxies.
No. The local group contains the Milky Way and a few other galaxies.
A group of galaxies is called a galaxy cluster or galaxy group.
None. Galaxies on the other hand do contain planets
A collection of galactic groups form a cluster of galaxies. A supercluster is the largest known structure. Galaxies can exist outside of a group or cluster, but the estimated amount is only about 5%. However, there is a possibility that these galaxies may have interacted or merged with other galaxies in the past,
Galaxies can be classified into three main sizes: dwarf galaxies, which are small and contain less than a few billion stars; Milky Way-sized galaxies, which are intermediate in size and contain a few hundred billion stars; and giant galaxies, which are massive and can contain trillions of stars.