Other astronomers were skeptical about Percival Lowell's claims ...

[arivle123]

Other astronomers were skeptical about Percival Lowell's claims of Martian canals because
 
  A) it did not seem possible for his telescope to see the surface through its thick atmosphere
  B) they discovered that Lowell suffered from poor vision
  C) they were able to prove that Lowell's telescope was faulty
  D) when they pointed their own telescopes toward Mars they couldn't see them

Question 2

Why do spiral galaxy mergers often trigger starbursts?
 
  What will be an ideal response?

[Eunice618]

Answer to Question 1

D

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.

[arivle123]

Excellent

[upturnedfurball]

Gracias!