Enduring Mystery of Mars’ Dark Moons Phobos and Deimos

    The weird shapes and colors of the tiny Martian moons Phobos and Deimos have inspired a long-standing debate about their origins. The dark faces of the moons resemble the primitive asteroids of the outer solar system, suggesting the moons might be asteroids caught long ago in Mars’ gravitational pull. But the shapes and … Continue reading Enduring Mystery of Mars’ Dark Moons Phobos and Deimos