Mercury (planet) Mercury (planet) Mercury is the smallest and innermost planet in the Solar System. Its orbital period around the Sun of 87.97 days is the shortest of all the planets in the Solar System. It is named after the Roman deity Mercury, the messenger of the gods. Like Venus, Mercury orbits the Sun within Earth's orbit as an "inferior planet", and never exceeds 28° away from the Sun. When viewed from Earth, this proximity to the Sun means the planet can only be seen near the western or eastern horizon during the early evening or early morning. At this time it
Stars and planetary systems in fiction Federation during the mid-23rd century). The primary was a Class F star. Magnitude of this star was +5, which was the same brightness as Sol. This was a Federation system, with at least one planet being an affiliate. Proxima Centauri, part of a triple star system with Alpha Centauri A and B, is the nearest-known star to the Solar System. Even though it is known to be a flare star, a disproportionate number of early fiction titles are dedicated to Proxima Centauri, as the destination of humanity's first interstellar voyage. A planet in Proxima Centauri's habitable zone was detected in