Which of these can be described as a system of stars, gases, dust, and other matter that orbits a common center of gravity?
A B C D
an asteroid a galaxy a nebula a comet
Question: Which of these can be described as a system of stars, gases, dust, and other matter that orbits a common center of gravity?
(A) an asteroid
(B) a galaxy
(C) a nebula
(D) a comet

Answer: (B) a galaxy
Answer: (C) a nebula
Question: Which of these can be described as a system of stars, gases, dust, and other matter that orbits a common center of gravity?
(A) an asteroid
(B) a galaxy
(C) a nebula
(D) a comet
Answer: (B) a galaxy