Pluto's density is most similar to: A) the terrestrial ...

[folubunmi]

Pluto's density is most similar to:
 
  A) the terrestrial planets.
  B) the jovian planets.
  C) moons of the jovian planets.
  D) Mercury, but nor Venus, Earth, or Mars.
  E) Saturn, but not Jupiter, Uranus, or Neptune.

Question 2

What is interstellar reddening and explain how it can be used to map out the distribution of dust in a cloud.
 
  What will be an ideal response?

[otokexnaru]

Answer to Question 1

C

Answer to Question 2

Short wavelength (blue) light passing through a cloud is blocked more than longer (redder) wavelengths by the dust grains. Thus starlight passing through a cloud appears redder than in the absence of a cloud. The amount of reddening can be measured by comparing a star's observed color to that expected for its spectral type. By looking at many stars and measuring the reddening toward each one, a map of the dust distribution can be built up.

[folubunmi]

Excellent

[amandalm]

TYSM