How is the sun situated in the universe?
A) The sun is an isolated star that is far outside of all the galaxies in the universe, and is thus not part of any galaxy.
B) The sun is just one of a large number of stars, and is located on the fringes of the Milky Way galaxy, which itself is just one galaxy among many galaxies.
C) The sun is just one of many stars, and is located near the center of the rest of the stars in the universe.
D) The sun is at the center of the universe.
E) Earth is at the center of the universe, and the sun orbits around the earth.
B
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The Sun will leave the main sequence in about ________ years from now.
A. 5 billion B. 5 million C. 100 billion D. 100 million
For the earth’s seasonal temperature at a particular location described by
What type of stars does the bar contain?
A.) Old, cool stars that glow redder. B.) Young, cool stars that glow bluer. C.) Old, hot stars that glow bluer. D.) Old, cool stars that glow bluer. E.) The bar isn't made of stars, just gas.
A solid lead sphere of radius 10 m (about 66 ft across!) has a mass of about 57 million kg. If two of these spheres are floating in deep space with their centers 20 m apart, the gravitational attraction between the spheres is only 540 N (about 120 lb). How large would this gravitational force be if the distance between the centers of the two spheres were tripled?
A. 60 N B. 180 N C. 1620 N D. 4860 N