You Find a Moon Orbiting a Planet

question 31

Multiple Choice

You find a moon orbiting a planet.The moon has a period of 10 days, and the average distance between the moon and planet is 10⁶ km.What is the planet's mass? Note that the mass of Jupiter is 1.9 * 10²⁷ kg.

• A) 0.1 M_Jupiter
• B) 0.4 M_Jupiter
• C) 1 M_Jupiter
• D) 4 M_Jupiter
• E) 10 M_Jupiter

---

Definitions:

Helmholtz

A German physicist and physician known for his contributions to the understanding of the mechanisms of vision and hearing among other areas.

Color Vision

The ability of organisms to differentiate colors, achieved through the varying sensitivities of photoreceptor cells in the eyes.

Opponent-Process Theory

The theory of color vision suggesting that three kinds of cells respond by increasing or decreasing their rate of firing when different colors are present.

Rhodopsin

A light-sensitive pigment found in the rods of the retina, critical for vision in low-light conditions.