Phobos and Deimos are the two moons of the planet Mars. Scientists believe that they are captured asteroids. Their orbits are particularly interesting; on one hand, Phobos (top image) is slowly getting closer and closer to Mars and will eventually crash into the surface, while Deimos (bottom image) is orbiting further and further away and will eventually escape the planet’s gravity.

(image sources: fisica.cab.cnea.gov.ar, www.enterprisemission.com)

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