Some quasars show absorption spectra with a smaller redshift than their emission spectra. This indicates that
A) they are much closer than previously thought.
B) there is cooler gas between us and the quasar.
C) we still don't understand redshifts.
D) their black holes are still contracting.
E) their black holes are still expanding.
Question 2
Redshift surveys give us
A) a 3-D layout of galaxies in space.
B) a better value of the speed of light.
C) an idea of how turbulent the intergalactic gas is.
D) the total mass of the universe.
E) a more accurate census of the Local Group.
Zonal wind speeds on Uranus. Shaded areas show the southern collar and its future northern counterpa
Ardipithecus kadabba has large canine teeth that are only slightly smaller than those of living apes
Oil and Natural Gas Production from More Wells in Smaller Areas
Diesel Emission Testing - Opacity Test.
The absorption spectra of the three classes of cones.
Barenboim's study show the change in children's descriptions of their peers