How are Cepheids and RR Lyrae stars different? What will be an ...

[nmorano1]

How are Cepheids and RR Lyrae stars different?
 
  What will be an ideal response?

Question 2

The runoff channels on Mars were most likely formed by:
 
  A) melting underground ice.
  B) catastrophic, but rare flooding.
  C) the annual melting of the polar ice caps.
  D) glaciers.
  E) rain that was part of a water cycle.

[jaymee143]

Answer to Question 1

Cepheids are large mass variable stars with a definite relationship between period and luminosity, which can be as high as thousands of suns. RR Lyrae stars are low mass variable stars with periods under one day, and all have about the same luminosity, about 100 suns.

Answer to Question 2

B

[nmorano1]

Thanks for the timely response, appreciate it

TYSM