How Often Do Sunlike Stars (Of a Type Considered Likely

question 26

Multiple Choice

How often do Sunlike stars (of a type considered likely to be circled by an inhabitable planet) form in the Milky Way Galaxy, on average?

• A) Hundreds of such stars form per year.
• B) About one such star forms per year.
• C) Astronomers cannot yet answer this question.
• D) Less than one such star forms per thousand years.

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Definitions:

Fat-Soluble Vitamin

Vitamin, such as A, D, E, and K, that is soluble in lipids and absorbed from the intestine along with lipids.

Diffusion

The process by which molecules move from an area of higher concentration to an area of lower concentration, helping in the distribution of substances within and between cells.

Active Transport

A cell's energy-consuming process to move substances across a cell membrane against a concentration gradient.

Diffusion

The movement of molecules from an area of higher concentration to one of lower concentration until equilibrium is reached.