In recent years, scientists have discovered thousands of exoplanets (planets orbiting stars other than the Sun). Some are in orbits similar to that of Earth, which revolves around the Sun (Msun = 1.99 × 1030 kg) at a distance of 1.50 × 1011 m — a distance defined as 1 astronomical unit (AU). Others have extreme orbits that are very different from anything in our solar system. For example, the exoplanet Kepler-42c circles its star at a distance of 0.0058 AU. Its star is small, having only 0.13 times the mass of the Sun. How long is Kepler-42c’s period of revolution? How does this value compare to Earth’s period of 365 days?

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