308K views · 6.8K reactions | Carl Sagan "Discovering Phobos & Deimos" (Royal Institution Lectures) ❤☮ #carlsagan #science #astronomy #mars | Saganism | Facebook

204K views · 2K reactions | Mars has two small, irregularly shaped moons, Phobos and Deimos, thought to be captured asteroids, named for the Greek mythological figures of fear and terror, companions to the god of war (Ares/Mars). Phobos orbits very close and fast, spiraling inward to eventually break apart, while Deimos is farther out and slower, appearing more star-like. Simulation via Space Engine | Galaxies Video | Facebook