Q171
Masses of stars and galaxies are usually expressed in ________.
A.
Earth's mass
B.
Solar mass
AnswerC.
Lunar mass
D.
Neutron mass
Answer: Option B
Solution
Answer: Option B
Solution:
Masses of stars and galaxies are usually expressed in Solar mass. The solar mass ( M ) is a standard unit of mass in astronomy, equal to approximately 2×1030 kg.