The brightest active galaxies are giant ellipticals
Indicate whether the statement is true or false
TRUE
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What evidence suggests that the Milky Way contains dark matter?
A) We observe stars and gas clouds far from the galactic center orbiting the galaxy at higher speeds than we would expect without dark matter. B) We see many lanes of dark material blocking out the light of stars behind them along the band of the Milky Way. C) We see many dark voids between the stars in the halo of the Milky Way. D) When we observe in different wavelengths, such as infrared or radio, we see objects that don't appear in visible-light observations. E) When we look at the galactic center, we are able to observe a large black hole that is composed of dark matter.
A main-sequence star's luminosity can directly inform us of
A) the star's radius. B) the rate at which it converts hydrogen to helium. C) the star's mass. D) the star's distance from us.
Most lunar craters are volcanic in origin
Indicate whether the statement is true or false
Four of the five answers listed below affect the rate of enzymatic reactions. Select the exception
a. pH b. temperature c. concentrations d. hormones e. buildup of product