Stars in Elliptical Galaxies Have Velocities That

question 66

Multiple Choice

Stars in elliptical galaxies have velocities that

• A) are random in direction.
• B) are very large in size.
• C) are equal in all directions.
• D) are constant in time.

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Definitions:

Coefficient of Determination

A statistic used in the context of regression analysis to assess the proportion of the variance in the dependent variable that can be explained by the independent variable(s).

Skin Cancer

A type of cancer that develops in the cells of the skin, often due to exposure to ultraviolet radiation from the sun or tanning beds.

UV's

Short for ultraviolet rays, which are electromagnetic radiation with a wavelength shorter than that of visible light but longer than X-rays.

Pearson Coefficient

A measure of the linear correlation between two variables, ranging from -1 to 1, where 1 implies a perfect positive correlation and -1 a perfect negative correlation.