Which hypothesis suggested that the Moon formed elsewhere and was later caught by Earth's gravity?
a. fission hypothesis
b. fusion hypothesis
c. large-impact hypothesis
d. capture hypothesis
e. condensation hypothesis
Question 2
A white dwarf is always the remnant of a star that ____.
a. ejected a planetary nebula
b. was a member of a close binary system
c. failed to ignite carbon
d. failed to ignite helium
e. became a red giant has a mass 20 times larger than our Sun