Author Question: Compared to the central regions of spiral galaxies, we expect elliptical galaxies to have A) ... (Read 36 times)

Sportsfan2111 · **on:** Jul 27, 2018

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