If an Astronomer on a Planet Orbiting a Nearby Star

question 1

Multiple Choice

If an astronomer on a planet orbiting a nearby star observed the Sun when Neptune was transiting in front of the Sun, how would the Sun's brightness change? Note that the radius of Neptune is 2.5 * 10⁷ m.

• A) The Sun's brightness would decrease by 0.1 percent.
• B) The Sun's brightness would increase by 0.1 percent.
• C) The Sun's brightness would increase by 1 percent.
• D) The Sun's brightness would decrease by 1 percent.
• E) The Sun's brightness would not change at all.

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Definitions:

Ribosomes

Small cellular structures that are the sites of protein synthesis in living cells.

Cell Wall

Cellular structure that surrounds a plant, protistan, fungal, or bacterial cell and maintains the cell’s shape and rigidity; composed of polysaccharides.

Transformation

In genetics, a process by which the genetic material carried by an individual cell is altered by the incorporation of foreign DNA from its surroundings.

Sex Pilus

A thin, tube-like structure used by some bacteria to transfer genetic material to another bacterium during conjugation.