A scientist claims that all red main-sequence stars are 1 billion ...

[appyboo]

A scientist claims that all red main-sequence stars are 1 billion years old. Which of the following, if true, would prove that this claim is false?
 
  A) The discovery of a red main-sequence star in a star cluster where the main sequence turnoff is about that of the Sun
  B) The discovery of a red main-sequence star in a star cluster where all the other stars are red giants or red supergiants
  C) Stellar evolution theory predicts that the main-sequence lifetime of red stars can be as long as 100 billion years.
  D) The minimum lifespan of a red main-sequence star is estimated to be 10 billion years.

Question 2

Most of the mass of the Milky Way is located in the halo of the galaxy in the form of dark matter.
 
  Indicate whether the statement is true or false

[matt]

Answer to Question 1

A

Answer to Question 2

TRUE