BepiColombo is slowly uncovering more and more fun facts about Mercury as it continues its preliminary mission. One of the ...

Mercury stands stationary at 3 A.M. EDT amid the stars of Cancer. The solar system’s smallest planet will now start sliding westward, or retrograde, appearing to “fall” back toward the Sun as it moves ...

Mercury, the smallest planet in the solar system, has spent billions of years quietly getting even smaller. Since its fiery beginnings 4.5 billion years ago, it has been steadily cooling and ...

NASA bragged Tuesday that its Kepler Space Telescope had discovered the two smallest planets ever found orbiting a distant star, but a UA astronomer and colleagues may have discovered even smaller ...