Astrophysics Unit 4
Quasars glow as bright as_______normal galaxies
1000
How many stars are in a large spiral galaxy?
100s of billions
What is the mass range of supermassive black holes?
10s of millions to billions of solar masses
How far away is andromeda?
2.5 million light years
How many years does it take the sun to orbit the center of the galaxy?
240 million
How many large spiral galaxies are contained in our group of galaxies?
3
What is the mass range of stellar black holes?
3 to 20 solar masses
How many small elliptical and irregular galaxies are contained in our group of galaxies?
40-50
Quasars have not been observed to exist in the past_____ years
5 billion years
What is the mass range of intermediate black holes?
75 to a couple hundred solar masses
What is the name of the closest spiral galaxy?
Andromeda
A planetary nebula is formed from the
Death of a low mass star
Which type of star cluster is believed to be the remnant core of cannibalized elliptical galaxies?
Globular
A group of galaxies is defined by a region where
Gravity beats expansion
Stars in an open cluster are usually
Hot, young, blue stars
What is the name of the supercluster we are in?
Laniakea (flow)/virgo(void)
What is the name of a galaxy with no defined arms?
Lenticular
The name of our galaxy is
Milky Way
What are the 4 size classifications of black holes?
Miniature/primordial, stellar, intermediate, super massive
A globular cluster usually contains
Old, swollen, red stars
Which type of star cluster is made of stars born of the same nebula and will eventually drift apart?
Open
What is the closest star-birthing nebula to us?
Orion
A supernova remnant nebula is most likely what nebula? The supernova remnant is just larger with heavier elements present.
Planetary nebula
What was the first discovered active galaxies that are feeding on gas and dust that is not moving fast enough to stay in orbit
Quasars
5 major structures of the universe larger than a star system
Supercluster, group of galaxies, galaxy, nebula, star cluster
Currently the supercluster of galaxies is defined by
The flow of galaxies with expansion mathematically removed
What is the name given to the group of galaxies that contains our galaxy?
The local group
What are binary stars that are double stars called?
Visual binaries (eclipsing binaries, spectral binaries)
A few years ago, a supercluster was defined by_______when there were 50-100 identified superclusters
Void
What are the types of galaxies?
spiral, barred spiral, elliptical, irregular
