Astrophysics Unit 4

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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


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