Compared to the central regions of spiral galaxies, we expect ...

[Sportsfan2111]

Compared to the central regions of spiral galaxies, we expect elliptical galaxies to have
 
  A) higher mass-to-light ratios because stars in elliptical galaxies are dimmer than those in spirals.
  B) lower mass-to-light ratios because stars in elliptical galaxies are dimmer than those in spirals.
  C) higher mass-to-light ratios because stars in elliptical galaxies do not have high orbital velocities.
  D) lower mass-to-light ratios because elliptical galaxies have less gas and dust than spirals.
  E) the same mass-to-light ratio because they are made of the same material, stars and dark matter.

Question 2

What is a shock front?
 
  A) a wave of pressure that moves faster than the speed of sound
  B) a wave of pressure that moves slightly slower than the speed of sound
  C) a wave of pressure that moves faster than the speed of light
  D) a wave of electromagnetic energy that can create electrical shocks
  E) the wave created when protons slam into electrons

[cadimas]

Answer to Question 1

A

Answer to Question 2

A

[Sportsfan2111]

Gracias!

[Jsherida]

Thanks for the timely response, appreciate it