How Have Astronomers Searched for Evidence of MACHOs in the Halo

question 21

Multiple Choice

How have astronomers searched for evidence of MACHOs in the halo of the Milky Way?

• A) They search for stars that are binary companions of MACHOs.
• B) They search for rapidly moving, massive gas clouds.
• C) They search for disturbances in the background of gravitational waves.
• D) They search for stars whose light is briefly amplified by gravitational lensing.
• E) They search for close binary stars undergoing mass transfer.

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A method of accounting that records transactions when cash is received or paid out rather than when they are incurred.

Extends Credit

A financial arrangement where a lender offers a borrower the possibility to purchase goods or services now and pay for them later.

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