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.
Lithotripsy. The direction of a sound pulse crushes the stones into smaller fragments that can be pa
Compared with modern humans, Homo erectus has a larger face, lacks a chin and canine fossa, and has
Bone fractures that occur before death show signs of healing. The process of fracture healing starts
Bright-Line Spectra of Hydrogen and Helium
Variable and absorption costing, explaining operating-income differences.
Please show all your work (4 marks)