Classify Galaxies

Spiral galaxies are best described as

• irregular in shape with random star movement.

• regular in shape with mostly orderly star movement.

• having a huge round shape with mostly very old stars.

• having a galactic bulge with a huge central black hole.

Spiral galaxies also contain massive lanes of gas & dust which leads to

• supermassive black holes.

• quasars.

• large regions of new star formation.

• aliens.

"Barred" spiral galaxies are called that because

• they have very little material at the center.

• they are really elliptical in shape.

• they have a massive bar of material at the center.

• of massive supernovae explosions near the center.

Compared to most elliptical galaxies, spiral galaxies are

• very large by comparison.

• very small by comparison.

• about the same size.

• are similar in size and shape to irregular galaxies.

Irregular galaxies are defined as having

• very little star formation.

• no real shape and are comparatively very small.

• no star formation

• supermassive black holes.

Galaxies are classified by their....

• Size

• Density

• Brightness

• Shape

What type of galaxy is this?

• Spiral

• Elliptical

• Irregular

Which of the following is a characteristic of spiral galaxies?

• They have a flat, rotating disk with spiral arms.

• They are spherical and lack structure.

• They are irregular in shape and lack a defined form.

• They are composed mostly of dark matter.

What is the main difference between elliptical and spiral galaxies?

• Elliptical galaxies have more gas and dust than spiral galaxies.

• Spiral galaxies have a well-defined disk and arms, while elliptical galaxies do not.

• Elliptical galaxies are younger than spiral galaxies.

• Spiral galaxies are composed entirely of stars.

Which type of galaxy is the Milky Way?

• Elliptical

• Irregular

• Spiral

• Lenticular