Galaxy Types
No
Do elliptical galaxies move?
10-15%
Elliptical galaxies are believed to make up about what percent of galaxies in some superclusters of galaxies?
Because of our position within the galactic disk
Why can't we observe the bar in the Milky Way very well from Earth?
No (very little amount)
Is there gas and dust commonly found in elliptical galaxies?
Yes
Is there gas and dust commonly found in irregular galaxies?
Yes
Is there gas and dust commonly found in spiral galaxies?
Yes
Do spiral galaxies move?
60%
Together with irregular galaxies, spiral galaxies make up approximately what percent of galaxies in the universe?
From a round sphere to a flattened, elongated shape
What is the range of shapes that an elliptical galaxy can appear to be like?
Undefined shape
What is the shape of an irregular galaxy?
Very large
What is the size of most elliptical galaxies?
Medium to large
What is the size of most spiral galaxies?
25%
Collectively, what percent of all galaxies do irregular galaxies take up?
Spiral galaxies
Do spiral or elliptical galaxies shine brighter?
They contain older stars and very little gas and dust
How are elliptical galaxies different from spiral galaxies?
They rotate
How do spiral galaxies move?
They were one of the two galaxies, but became deformed by the gravitational pull of nearby large spiral galaxies
How might some irregular galaxies have once been spiral or elliptical galaxies?
middle-aged
How old are the stars typically in spiral galaxies?
As a poorly organized mass of stars that are usually small and therefore, dim
Instead of having a core, how are irregular galaxies organized?
Amounts of gas and dust
Irregular galaxies contain an abundance of what?
In globular clusters of stars near the edge of the spiral arms
Specifically, where do the younger stars in a spiral galaxy reside?
The Spitzer Space Telescope
The evidence proving that the Milky Way was a barred spiral galaxy came from what tool?
Two small, irregular galaxies which orbit around our own Milky Way
What are The Large and Small Magellanic Clouds?
The Large and Small Magellanic Clouds
What are examples of irregular galaxies?
The spiral structures that extend from the center into the disk
What are spiral galaxies named for?
disks
What are spiral galaxies shaped like?
Spiral, elliptical, irregular
What are the three types of galaxies?
Clouds of gas and dust (nebulas)
What can also be found in spiral galaxies besides middle-aged stars?
Spiral outwards
What do a spiral galaxy's arms do?
Globular clusters
What do elliptical galaxies tend to be surrounded by?
A cucumber
What everyday object could best represent the shape of an elliptical galaxy
The Milky Way
What galaxy are we located in?
M32
What is an example if an elliptical galaxy?
Bulges
What is in the center of spiral galaxies?
Andromeda
What is our closest neighbor galaxy?
Old stars
What is the central bulge of a spiral galaxy composed of?
There are stars in the galactic center
What is the most convincing evidence for the Milky Way being a barred spiral galaxy?
Young stars
What kind of stars are most commonly found in the arms of spiral galaxies?
Older, low mass stars
What kinds of stars (2 descriptions) are in the center of an elliptical galaxy
A core (nuclear bulge or spiral arm structure)
What major aspect of most galaxies do irregular galaxies not have?
The spiral arms
What portion of a spiral galaxy is the brightest?
A spiral structure
What structure could not describe an elliptical galaxy?
A large spiral galaxy
What type of galaxy is Andromeda?
A barred spiral galaxy
What type of galaxy is the Milky Way?
Young stars
What type of stars are most common in irregular galaxies?
As it rotates
When do a spiral galaxy's arms spiral outwards?
In low-density regions
Where are spiral galaxies mostly found?
In the centers of galaxy clusters
Where are spiral galaxies usually not found?
The spiral arms
Where are stars formed in spiral galaxies?
Spiral Galaxy
Which galaxy has a bulge in the center?
The younger, hot stars inhabit the arms of the spiral galaxy
Why are the arms of a spiral galaxy brighter than the surrounding disk?
They do not fall into any of the regular classes of galaxies and are often chaotic in appearance
Why aren't irregular galaxies classified more specifically?
The stars in an elliptical galaxy are older, and therefore not as bright
Why do spiral galaxies shine brighter than elliptical galaxies?
There are very few nebulas, so there is minimal star formation
Why don't elliptical galaxies have younger stars?
