A close encounter with a mysterious moon - Phys.org

In 1877, American astronomer Asaph Hall discovered two small moons circling the planet Mars, later named Phobos and Deimos after the Greek for "fear" and "panic."In 1877, American astronomer Asaph Hall discovered two small moons circling the planet Mars, later named Phobos and Deimos after the Greek for "fear" and "panic." But it was excitement, rather than ?