What fraction of the energy density of the universe consists of dark matter?
a) 75 percent
b) 1 percent
c) 99 percent
d) 21 percent
e) 4 percent
Ans: d) 21 percent
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Austenitic stainless steel _________ ferromagnetic.
Fill in the blank(s) with the appropriate word(s).
A galaxy's supermassive black hole represents about ____ for elliptical galaxies
a. half a percent of the mass of the disk b. five percent of the mass of the central bulge c. half a percent of the mass of the central bulge d. five percent of the mass of the disk e. half a percent of the dark matter in the corona
Events that are simultaneous in one inertial reference frame are simultaneous in all inertial reference frames
Indicate whether the statement is true or false
Relative to the stars, the Moon moves about ____ eastward in the sky each night
a. 1° b. 5° c. 13° d. 27.3° e. 29.5°