Deimos, one of the two moons of Mars, is a teeny little guy with an average radius of just 6.2 km.

Deimos, one of the two moons of Mars, is a teeny little guy with an average radius of just 6.2 km.

#OnThisDay in 1877 American astronomer Asaph Hall discovers the Mars moon Deimos. http://en.wikipedia.org/wiki/Deimos_(moon)

#OnThisDay in 1877 American astronomer Asaph Hall discovers the Mars moon Deimos. http://en.wikipedia.org/wiki/Deimos_(moon)

Human Mission to Deimos...moon of Planet Mars. http://www.aerospaceguide.net/moons.html #space #travel #red #planet #moons

Human Mission to Deimos...moon of Planet Mars. http://www.aerospaceguide.net/moons.html #space #travel #red #planet #moons

Phobos: Doomed Moon of Mars. Its orbit is so close to Mars that gravitational forces will cause it to shatter.

Phobos: Doomed Moon of Mars. Its orbit is so close to Mars that gravitational forces will cause it to shatter.

Phobos, the larger and closer moon, occults Deimos, the smaller and more distant moon in the Martian sky. Image credit: NASA/JPL-Caltech/Malin Space Science Systems/Texas A&M Univ.

Phobos, the larger and closer moon, occults Deimos, the smaller and more distant moon in the Martian sky. Image credit: NASA/JPL-Caltech/Malin Space Science Systems/Texas A&M Univ.

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