What did Asaph Hall III discover in 1877?
The formation of Black Holes
The two moons of Mars
The orbit of Mercury
The rings of Saturn
Answer
In 1877, Asaph Hall III discovered the two moons of Mars, Phobos and Deimos. Phobos is the larger of the two, with a diameter of about 17 miles (28 km). It orbits Mars in just over 7 hours. Deimos is smaller, with a diameter of about 12 miles (19 km). It orbits Mars in just over 30 hours. Both moons are thought to be captured asteroids.
Unlocking the Cosmos: The Asaph Hall Quiz
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