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.
A
You might also like to view...
How does Mercury's magnetic field compare to our own?
A) Like Venus, Mercury has no detectable magnetic field. B) Like Mars and the Earth, it too has undergone polarity reversals. C) It is 1/100th as strong as ours, but does deflect the solar wind to some degree. D) It is amazingly strong, comparable to our own. E) It was predicted from Mercury's rapid rotation and molten core.
The ________ tides occur when there is little tidal variation, near first and third quarter moons
Fill in the blank(s) with correct word
Which of the following can't be associated with the spiral arms of a galaxy?
a. Dust and gas b. Metal poor stars c. Young, massive stars d. Star formation
A Hooke's law spring is compressed a distance d and is used to launch a particle of mass m vertically to a height h above its starting position. Under double the compression, the spring is now used to launch a particle of mass 2m. How high does the second mass rise above its starting position?
a. h b. 2h c. 3h d. 4h