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Home Q & A Board Science-Related Homework Help Physics Astronomy
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reubank reubank
wrote...
Posts: 508
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6 years ago
How does gravity lensing let us find massive dark objects?
 
  What will be an ideal response?

Question 2

The main constituent of the Martian atmosphere is:
 
  A) hydrogen.
  B) helium.
  C) methane.
  D) carbon dioxide.
  E) nitrogen.

Question 3

Of the terrestrial planets, Mars seems to most promising to exobiologists.
 
  Indicate whether the statement is true or false

Question 4

What percentage of the solar nebula's mass consisted of rocky material?
 
  A) 0 percent
  B) 0.4 percent
  C) 2 percent
  D) 20 percent
  E) 80 percent
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Replies
wrote...
#1
6 years ago
Answer to q. 1

When a black hole or brown dwarf passes between us and a bright star, the gravity of the dark object can bend and focus the light of the distant star, making it brighten temporarily. The more massive the unseen object, the longer this brightening will last.

Answer to q. 2

D

Answer to q. 3

TRUE

Answer to q. 4

B
reubank Author
wrote...
#2
6 years ago
Above and beyond my expectations for this site
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