Galaxies

What classification would you give a galaxy that has a barred center, very compact spiral arms, and a bright center?

• Sa
• SBa
• SBc
• Sb

What classification would you give a galaxy that has a circular core, stretched out spiral arms, and a small/dim center?

• SBc
• SBb
• Sa
• Sc

What classification would you give a galaxy that has no spiral arms, and is shaped like a perfect sphere?

• E0
• Sa
• E7
• SBa

What classification would you give a galaxy that has no spiral arms, has a black hole at the center, and is disk-shaped?

• Sa
• E7
• S0
• SBa

Which of the following galaxies does not have a black hole at the center?

• Lenticular
• Spiral
• Elliptical
• Irregular

What type of stars exist in the center of a spiral galaxy?

• Young, Bright Stars
• Young, Yellow Stars
• Bright, White Stars
• Old, Dim Stars

Where do new stars form in spiral galaxies?

• In the spiral arms
• In the core
• In the halo
• In the nucleus

What type of stars are elliptical galaxies made of?

• Bright Stars
• Massive Stars
• Old stars
• Young Main Sequence Stars

Why don’t elliptical galaxies have spiral arms?

• They have no black hole
• The stars orbit in different directions
• The black holes have weaker gravity
• Their stars do not orbit around the nucleus

Which of the following are not characteristics used to classify spiral galaxies?

• How compact the arms are

• How large the galaxy is

• How large the core is

• How smooth the arms are