The age of stars in a cluster can be determined by A) finding ...

[Medesa]

The age of stars in a cluster can be determined by
 
  A) finding spectroscopic binaries in the cluster.
  B) determining the main sequence turnoff point.
  C) finding pulsating variable stars in the cluster.
  D) counting the number of stars in each spectral class.
  E) fitting the position of the main sequence to the Sun.

Question 2

Which of the following is not a characteristic of the outer planets?
 
  A) They all have rings.
  B) They all have large quantities of gas.
  C) They have very few, if any, satellites.
  D) They are primarily made of hydrogen and helium.
  E) Their orbits are separated by relatively large distances.

[zhanghao]

Answer to Question 1

B

Answer to Question 2

C

[Medesa]

TYSM

[covalentbond]

Gracias!