Author Question: Pluto's density is most similar to: A) the terrestrial planets. B) the jovian planets. C) moons ... (Read 111 times)

folubunmi · **on:** Jul 27, 2018

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 · **Reply #1 on:** Jul 27, 2018

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.