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
The two bright stars are (left) Alpha Centauri and (right) Beta Centauri.
Various views of the main body cavities.
The DNA from one chromosome has a mass of ~20 billion Daltons
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Rapidly decreasing sequence costs have enabled the rapid expansion
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