Galaxies
A large collection of stars, gas, dust, and dark matter held together by gravity.
What is a galaxy.
What type of galaxy is the Milky Way?
What is a barred spiral galaxy.
A region in space where gravity is so strong that not even light can escape.
What is a black hole.
Can we see dark matter directly? Why?
What is no, it does not emit or absorb light.
What is found at the center of most galaxies, including the Milky Way?
What is a supermassive black hole.
What kind of galaxy has no specific shape and often looks scattered or uneven?
What is an irregular galaxy.
Approximately how long does it take the solar system to orbit the center of the Milky Way once?
What is about 225 million years.
What is the boundary around a black hole called, where nothing can escape once crossed?
What is an event horizon.
What percentage of the universe’s total mass is estimated to be dark matter?
What is about 27%.
What happens to galaxies when they collide?
What is they merge and form new, larger galaxies.
Approximately how many galaxies are there in the universe?
What is approximately 200 billion, but most likely more.
What is the name of the galaxy closest to the Milky Way that is on a collision course with it?
What is the Andromeda galaxy.
What forms a black hole?
What is the collapse of a super massive star after it supernovas.
What is dark matter made up of?
What is they don't know. It is composed of unknown particles we have yet to discover.
How far are we from the center of the Milky Way?
What is about 3/5 from the center to the outer edge ~ 27,000 light years.
What type of galaxy is made mostly of older stars and has a round or oval shape?
What is an elliptical galaxy.
What is the name of the supermassive black hole at the center of the Milky Way?
What is Sagittarius A.
In order to escape the gravitational field around a black hole, and object would need to be able to do what?
What is travel equal to or greater than the speed of light.
When was dark matter discovered?
What is the 20th century (1900s).
The distance between a black hole and it's event horizon is called this.
What is the Schwarzschild radius.
In what decade did Edwin Hubble discover that the Milky Way was not the only galaxy in the universe?
What is the 1920s.
In which part of the Milky Way is our solar system located?
What is in an outer arm called the Orion Arm.
A theoretical process that describes how an object is stretched and compressed by a black hole's gravitational field.
What evidence shows dark matter exists even though it can’t be seen?
The rotational speed or galaxies.
The way light bends (gravitational lensing)
What is it called when a galaxy's nucleus produces more radiation than the rest of the entire galaxy?
What is an Active Galactic Nuclei.