Dark Matter Suspected to Exist in the Universe Because

question 32

Multiple Choice

Dark matter suspected to exist in the universe because:

• A) the night sky is dark between stars
• B) the orbital period of stars in the outer parts of a galaxy is greater than the orbital period of stars near the galactic center
• C) the orbital period of stars in the outer parts of a galaxy is less than the orbital period of stars near the galactic center
• D) the orbital period of stars in the outer parts of a galaxy is about the same as the orbital period of stars near the galactic center
• E) all galaxies have about the same mass

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Definitions:

Reconstruction

The period after the American Civil War from 1865 to 1877, during which the Southern states were reorganized and reintegrated into the Union.

American History

The record of events and happenings that form the past of the United States, from pre-colonial times to the present.

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A significant transformation or restructuring of an economy, which might involve policy changes, innovation, or shifts in major industries.

Thaddeus Stevens

A prominent 19th-century U.S. politician and abolitionist, known for his leadership in passing the 13th Amendment, which abolished slavery.