Galaxy Cluster
Material
Material
What is dark matter?
An invisible substance that forms about 85% of the mass in the universe, but it does not shine or interact with light.
What is gravitational lensing?
The bending of light by the gravity of a massive object causes it to act like a lens, distorting, magnifying, or creating multiple images of distant background objects.
What are Galaxy clusters?
They are thousands of galaxies stringed together in a chain of some sort.
What is gravity?
The invisible force of attraction that exists between any two objects with mass or energy, causing them to pull toward each other.
What makes up a galaxy's mass?
Dark matter (80-85%)
Hot Intracluster Gas (5%)
Galaxies and stars (1-5%)
What is a spectroscopic survey?
A large-scale astronomical project that collects and analyzes spectra from many celestial objects.
How many clusters at a time can a Galaxy cluster hold?
Hundreds to thousands of galaxies.
What is Plasma?
An electrically charged state of matter composed of free electrons and ions, also known as ionized gas.
What is the structure of a galaxy cluster?
Galexies, hot, emitting gas, and a significant amount of dark matter.
How do you identify galaxy clusters?
You can identify a galaxy cluster by looking at the “overdensity” or by looking at optical and infrared imaging. A spectroscopic survey can also identify them.
How do Galaxy Clusters hold each other together?
They use each others gravity to link.
What is light bending?
The change in direction of light as it passes from one medium to another, such as from air to water.
What is a galaxy clusters mass?
1014 to 1015 solar masses
How does NASA find a galaxy clusters mass?
gravitational lensing
What galaxy cluster is the Milky Way on the edge of?
The Virgo Supercluster.
What is hot gas?
Essentially plasma but the electrons haven't been stripped from it.