Explain why it is so difficult to see planets around other stars. ...

[jho37]

Explain why it is so difficult to see planets around other stars.
 
  What will be an ideal response?

Question 2

From where did the molecular oxygen in Earth's atmosphere originate?
 
  A) photosynthesis from plant life
  B) photosynthesis from single-celled organisms
  C) outgassing from volcanoes
  D) atmospheric bombardment
  E) oxidation of surface rocks

[jjorrostieta]

Answer to Question 1

Planets are very faint compared to the stars they orbit. Moreover, they are very close to their parent star compared to the distance between stars. On the 1-to-10 billion scale, where the Sun is the size of a grapefruit and Earth is a pinhead about 15 meters way, the nearest star is several thousand kilometers away. Together, this makes it extremely difficult to distinguish the faint light of a planet from the star it orbits. (Nevertheless, massive Jupiter-like planets have been indirectly detected orbiting around nearby stars.)

Answer to Question 2

B

[jho37]

Thank you!

[jjorrostieta]

Always glad to help...