Since brown dwarfs cannot ignite hydrogen fusion, how might we ...

[tsand2]

Since brown dwarfs cannot ignite hydrogen fusion, how might we hope to spot them? What role does deuterium play in this?
 
  What will be an ideal response?

Question 2

Large molecules found in meteorites and interstellar clouds is evidence that:
 
  A) life is abundant in the galaxy.
  B) life has definitely formed in other places than Earth.
  C) chemical evolution has taken place elsewhere in the Universe.
  D) organic molecules are extremely rare.
  E) life originated on Mars before Earth.

[prumorgan]

Answer to Question 1

In the Kelvin-Helmholtz contraction, they will become hot and luminous enough to give off detectable red light, but not for long, so you should look for them in star forming regions. Also, more massive ones than 12 Jupiters can shine briefly by deuterium fusion, but as the supply of deuterium is very limited, that process too will not last long.

Answer to Question 2

C

[tsand2]

Excellent

[scikid]

Wow, this really help