What is the difference between the solar system, the galaxy, and the universe? (select all that apply.)
a. the universe contains all physical matter and energy except for that within galaxies and solar systems.
b. the solar system contains approximately 100 billion stars, of which the sun is one, as well as large clouds of gas and dust.
c. the galaxy contains thousands of similar solar systems.
d. the solar system is much larger than the galaxy but much, much smaller than the universe.
e. the solar system contains the sun and objects that orbit it, including the eight planets, comets, and asteroids, and the galaxy contains approximately 100 billion stars, of which the sun is one, as well as large clouds of gas and dust.
f. the universe contains all physical matter and energy. its basic constituents are the clusters of galaxies
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