Most of the halo stars are very old. Indicate whether the ...

[Mr. Wonderful]

Most of the halo stars are very old.
 
  Indicate whether the statement is true or false

Question 2

The key to identifying a black hole candidate in a binary system is that
 
  A) one of the two stars cannot be seen.
  B) the unseen companion in the system must have a sufficiently high mass.
  C) the unseen star is a contact binary.
  D) the system must be a very strong source of radio emissions.
  E) the visible companion must be an evolving main sequence or giant star.

[Briannahope]

Answer to Question 1

TRUE

Answer to Question 2

B

[Mr. Wonderful]

Gracias!

[ryhom]

TYSM