Seyfert Galaxies Are a Distinct Class of Galaxies Because They

question 43

Multiple Choice

Seyfert galaxies are a distinct class of galaxies because they

• A) are very close to the Milky Way and appear to be gravitationally bound to it.
• B) have very bright, very hot starlike central cores with variable energy output.
• C) are completely devoid of structure, appearing to be amorphous spheres of gas and dust.
• D) are in the constellation of Seyfert in Earth's southern hemisphere sky.

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Definitions:

Eosinophils

A type of white blood cell, part of the immune response especially involved in fighting parasites and allergic reactions.

Neutrophils

A type of white blood cell important in the body's defense against infection by engulfing and destroying pathogens.

Hematocrit

The ratio of the volume of red blood cells to the total volume of blood, expressed as a percentage.

Red Blood Cells

Disc-shaped cells essential for transporting oxygen throughout the body using a protein called hemoglobin.