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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Excise Tax

A specific tax levied on the sale of a particular good or service, often included in the price of items such as tobacco or alcohol.

Tax Rate

The percentage at which income or property is taxed by a government.

Pretax Equilibrium

The market equilibrium that occurs before any taxes are applied to goods or services, reflecting the balance between supply and demand without tax-induced price distortions.

Employment-At-Will Doctrine

The employment-at-will doctrine is a legal principle that allows either the employer or the employee to terminate employment at any time without having to provide a reason, barring illegal discrimination.