Suppose We Observe a Cepheid Variable in a Distant Galaxy

question 56

Multiple Choice

Suppose we observe a Cepheid variable in a distant galaxy. The Cepheid brightens and dims with a regular period of about 10 days. What can we learn from this observation?

• A) We can learn the distance to the galaxy.
• B) It will allow us to calculate the rotation rate of the galaxy.
• C) It will allow us to determine the mass of the galaxy.
• D) Under the rules of the International Astronomical Union, we will be entitled to naming rights for the galaxy.

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Definitions:

Note Collected

A financial transaction where a receivable note is received or paid off, often reflecting incoming cash flow from a debtor.

Petty Cash

A small amount of cash on hand used for covering minor expenses.

Deducted

To subtract an amount from a total, often related to expenses or taxable income.

Bank

A financial institution licensed to receive deposits and make loans, in addition to offering various other financial services.