How are clusters of galaxies arranged throughout the universe?
Clusters are then grouped together in superclusters which contain dozens of clusters. Superclusters are up to 30 Mpc across. Recent observations show that superclusters are arranged in sheets with huge voids in between, and that matter in the universe is arranged in a filamentary structure.
What is a cluster of galaxy clusters called?
Galaxies are the building blocks of the universe. Clusters of galaxies, and clusters of clusters of galaxies, called superclusters, make up the structures in the geography of the universe.
How many galaxies clusters are in the universe?
NARRATOR: The universe contains about 100 billion galaxies in gigantic groups called galaxy clusters. Clusters are portions of space where many galaxies, sometimes thousands, are concentrated. These clusters are themselves contained within colossal superclusters.
How are clusters of galaxies formed?
Astronomers think that galaxy clusters form as clumps of dark matter and their associated galaxies are pulled together by gravity to form groups of dozens of galaxies, which in turn merge to form clusters of hundreds, even thousands of galaxies.
What is the difference between a galaxy group and a galaxy cluster?
A typical galaxy group has around 50 galaxies, and contains a total mass of about 10 trillion times the mass of the Sun. Galaxy clusters are even larger, and can contain up to 1000 galaxies., with a mass of 100 trillion to 1000 trillion suns.
How are galaxies held together?
Our galaxy, the Milky Way, is typical: it has hundreds of billions of stars, enough gas and dust to make billions more stars, and at least ten times as much dark matter as all the stars and gas put together. And it’s all held together by gravity.
What cluster is Earth in?
Virgo Supercluster
Well, Earth is located in the universe in the Virgo Supercluster of galaxies. A supercluster is a group of galaxies held together by gravity. Within this supercluster we are in a smaller group of galaxies called the Local Group. Earth is in the second largest galaxy of the Local Group – a galaxy called the Milky Way.
Are galaxy clusters expanding?
One of these explanations is that large groups of galaxy clusters might be moving together, but not because of cosmic expansion. For example, it is possible some nearby clusters are being pulled in the same direction by the gravity of groups of other galaxy clusters.
Is a cluster bigger than a galaxy?
When comparing the two, a typical globular cluster might contain a mass of 100,000 Suns, whereas the Milky Way has nearly 1 trillion solar masses. In other words, the Milky Way Galaxy contains 10 million times more mass than a typical globular cluster.
How are clusters made?
Clusters are made up of two basic types of matter: luminous matter (like stars and hot gas) and dark matter. Dark matter does not shine on its own, and the only way we know it exists is because of its gravitational affect on luminous matter.
Why are galaxy clusters important?
Galaxy clusters are the largest gravitationally-bound structures in the universe. As such, they are powerful tracers of the structures of matter on the largest scales, allowing us to measure the properties of the universe itself.