A star can be a supernova: A) in predictable cycles of ...

[yoooooman]

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

[bhavsar]

Answer to Question 1

E

Answer to Question 2

FALSE

[yoooooman]

Gracias!

[Sarahjh]

Thanks for the timely response, appreciate it