Author Question: A star can be a supernova: A) in predictable cycles of decades. B) a few times, at unpredictable ... (Read 94 times)

yoooooman · **on:** Jul 27, 2018

A star can be a supernova:

A) in predictable cycles of decades.
B) a few times, at unpredictable intervals.
C) only if it can fuse iron in its core.
D) before it reaches the main sequence, if it is massive enough.
E) only once.

Question 2

Saturn is the only planet with a ring system.

Indicate whether the statement is true or false