Within the boundaries of the constellations Coma and Virgo are found
A) the largest nearby superclusters of galaxies.
B) the Large and Small Magellanic Clouds.
C) the most distant known quasars.
D) the closest red dwarfs to the Sun.
E) all the galaxies in the Local Group.
A
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Radio communication between distant places on Earth is possible because the
A) ionosphere reflects radio signals. B) ionosphere transmits radio signals. C) stratosphere reflects radio signals. D) exosphere reflects radio signals.
Which of the following lists the ingredients of the solar nebula from highest to lowest percentage of mass of the nebula?
A) hydrogen and helium gas, hydrogen compounds, rocks, metals B) hydrogen compounds, hydrogen and helium gas, rocks, metals C) hydrogen and helium gas, hydrogen compounds, metals, rocks D) hydrogen compounds, hydrogen and helium gas, metals, rocks E) hydrogen compounds, rocks, metals, hydrogen and helium gas
Einstein's theory of relativity tells us that travelers who make a high-speed trip to a distant star and back will
A) age less than people who stay behind on Earth. B) age more than people who stay behind on Earth. C) have more fun than people who stay behind on Earth. D) never be able to make the trip within their lifetimes.
The distinction between impulse and force involves the
A) distance the force acts. B) time the force acts. C) difference between acceleration and velocity. D) mass and its effect on resisting a change in momentum.