One piece of evidence against the possibility of water on Mars ...

[sammy]

One piece of evidence against the possibility of water on Mars is:
 
  A) the current lack of water on Mars.
  B) the fact that the polar ice caps are made of carbon dioxide ice.
  C) the volcanic activity on Mars.
  D) the few carbonate rock layers that would have formed on the bottoms of oceans.
  E) the hydrated chemical compounds found on surface rocks all over the planet.

Question 2

Why are brown dwarfs easier to spot in a young, star forming region like Orion rather than an old group of stars like a globular cluster?
 
  What will be an ideal response?

[brittiany.barnes]

Answer to Question 1

D

Answer to Question 2

Like stars, but even more so, brown dwarfs are more luminous when they are young. They produce infrared radiation from the release of gravitational energy as they collapse and are therefore brighter and easier to see when they are forming.

[sammy]

Both answers were spot on, thank you once again

[brittiany.barnes]

Great! Please up vote