Author Question: Because the Moon has a low average density and no magnetic field, then its dense core must be ... (Read 57 times)

asan beg · **on:** Jul 27, 2018

Because the Moon has a low average density and no magnetic field, then its dense core must be _______________.

Fill in the blank(s) with correct word

Question 2

Supernovae are ____.

a. very common: there are thousands of detectable events occurring in our galaxy each year
b. common: a few dozen are detected in our galaxy each year
c. uncommon: there are only one or two detected in our galaxy each year
d. rare: only one or two occur each century in our galaxy
e. extremely rare: only one or two are detected in the Universe each decade