Author Question: A scientist claims that all red main-sequence stars are 1 billion years old. Which of the following, ... (Read 79 times)

appyboo

  • Hero Member
  • *****
  • Posts: 527
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

  • Sr. Member
  • ****
  • Posts: 344
Answer to Question 1

A

Answer to Question 2

TRUE



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.

Did you know?

Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

Did you know?

ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.

Did you know?

In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

Did you know?

Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.

For a complete list of videos, visit our video library