A Scientist Claims That All Red Main- Sequence Stars Are

question 98

Multiple Choice

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)Stellar evolution theory predicts that the main- sequence lifetime of red stars can be as long as 100 billion years.
• B)The minimum lifespan of a red main- sequence star is estimated to be 10 billion years.
• C)The discovery of a red main- sequence star in a star cluster where all the other stars are red giants or red supergiants
• D)The discovery of a red main- sequence star in a star cluster where the main sequence turnoff is about that of the Sun

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Definitions:

Cash Inflows

Money received by a business during a period of time, including sales, investment income, and financing.

Required Rate

The required rate, often referred to as the required rate of return, is the minimum expected rate of return on an investment deemed acceptable to an investor.

Unequal Cash Flows

Cash inflows or outflows over a period that vary in amount, which are crucial in investment analysis and capital budgeting.

Present Value

The current worth of a future sum of money or stream of cash flows given a specified rate of return.