Assume that astronomers discover a new moon orbiting Jupiter at a distance of 0.010 AU. Approximately how many eclipses would the new moon experience per month?

A moon that passes through Jupiter’s shadow can experience about one eclipse each orbit. Using Kepler’s law for a moon 0.010 AU from Jupiter gives an orbital period of about 12 days, or roughly 2.5 orbits in a 30-day month. That is approximately 3 eclipses per month, so the correct choice is C) 3.

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