Which two moons of Mars did Asaph Hall III discover?
Ganymede and Callisto
Titania and Oberon
Dione and Rhea
Phobos and Deimos
Answer
Asaph Hall III discovered the two moons of Mars, Phobos and Deimos, in 1877. Phobos is the larger and closer moon, and Deimos is the smaller and further moon. Phobos is about 15 miles across and orbits Mars in just over seven hours. Deimos is about 12 miles across and orbits Mars in about 30 hours. Both moons are thought to be captured asteroids.
Unlocking the Cosmos: The Asaph Hall Quiz
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