To denote the luminosity of stars, as a reference, astronomers use the luminosity of
A. the cluster of stars at the center of the Milky Way galaxy.
B. the Sun.
C. the Northern Star.
D. Proxima Centauri, our solar system's closest neighbor star.
Answer: B
You might also like to view...
Twitching is a hallmark of exposure to which type of agent?
a. Choking b. Nerve c. Blister d. Cyanide compound
Which of the following biomes has the most annual rainfall?
a. the chaparral b. the tropical dry forest c. temperate deciduous forest d. temperate rainforest
Which of the following statements about water resources is true?
A) The U.S. Environmental Protection Agency frequently creates policy for questions of water quantity and distribution. B) Most water policy decisions in the United States are made at national levels. C) Many countries have addressed their water resources and water needs with national policies and agencies. D) The World Water Forum has found that water supplies for developing nations will stabilize over the next decade.
This is the amount that actually is evaporated under existing conditions
A) Potential evapotranspiration B) Potential evaporation C) Actual evapotranspiration D) Actual evaporation E) Desired evaporation