On the H-R diagram, the bright blue stars that dominate the ...

[Haya94]

On the H-R diagram, the bright blue stars that dominate the naked-eye sky lie
 
  A) at the top left.
  B) at the lower left.
  C) in the middle of the main sequence.
  D) at the top right.
  E) at the lower right.

Question 2

Why does the merger of two spiral galaxies often trigger starbursts?
 
  What will be an ideal response?

[jennafosdick]

Answer to Question 1

A

Answer to Question 2

The dusty molecular clouds in spiral galaxies collide during a merger. The collision transfers angular momentum from the innermost gas clouds to the outer parts of the galaxies, which allows the inner clouds to migrate toward a common center. Huge amounts of dense clouds come together, resulting in a massive burst of star formation.

[Haya94]

TYSM

[parshano]

Gracias!