The Apparent Reddening of Light from Stars After Its Passage

question 279

Multiple Choice

The apparent reddening of light from stars after its passage through the interstellar medium is caused by

• A) the additional contribution to this starlight by emission from hydrogen gas in the interstellar medium.
• B) preferential scattering of blue starlight by dust grains.
• C) Zeeman shift of the light by the powerful magnetic fields existing within the interstellar medium.
• D) scattering of this light from rapidly moving material; the light is Doppler-shifted toward the red end of the spectrum.

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Definitions:

Skeletal Muscle Fibers

Cellular components of skeletal muscles that contract to produce voluntary movements of the body.

Voluntary Control

The ability to consciously control movements of the body or parts of the body, such as limbs.

Striated

Having a series of linear marks, grooves, or ridges; often used to describe muscle tissue that appears striped under a microscope.

Cylindrical-Shaped

Describes an object or structure with a straight, round shape that is uniform in diameter throughout its length.