Star and Galaxy Classification

What type of Spiral galaxy is this?

• S0

• Sb

• Sa

• SBa

This galaxy still has a large quantity of gas and dust, and no observable bar of stars.

This galaxy is a

(a)   galaxy.

• Irregular

• Lenticular

• Spiral
• Barred Spiral

What type of galaxy is this?

• Irregular

• Elliptical

• Spiral

• It isn't a galaxy

What type of galaxy is this?

• Irregular

• Spiral

• Barred Spiral

• Elliptical

What type of galaxy is this?

• Spiral
• Elliptical
• Irregular
• Irrational

Spiral galaxies are best described as...

Hint: more than one answer may be correct.

• 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.

There are ​ (a)   main galaxy types are there in the observable universe?

• two

• four

• infinite

• three

"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.

Barred spirals (SB) are further classified as "SBa" & "SBb" etc. based on

• the size of the central supermassive black hole.

• the distances of stars to the supermassive black hole.

• the amount of stars near the galactic bulge.

• stars that make up the bar size & shape.

Astronomers currently classify the Milky Way as a(n)

• Lenticular galaxy

• Barred Spiral

• Spiral

• Elliptical