According to their rotation curves, most spiral galaxies
A) rotate as a solid body.
B) rotate counterclockwise.
C) have decreasing rotational speeds with increasing distance.
D) contain dark matter.
E) contain dark energy.
D
You might also like to view...
The Sun's rays are transmitted to Earth by means of
a. radiation. b. convection. c. temperature. d. conduction.
The atmosphere of ____________________ contains acid compounds including sulfuric and hydrochloric acid
Fill in the blank(s) with correct word
Neutron stars do NOT have:
A) masses greater than 1.4 solar masses. B) sizes comparable to large cities. C) strong magnetic fields. D) large surface gravities, compared to the Sun. E) rotation periods comparable to the Sun's.
A thermodynamic engine has an efficiency of 35.0% and receives 150 J of energy per cycle
(a) How much work does it do in each cycle? (b) How much thermal energy does it "waste" in each cycle?