Planet Mewcury

Planet Mewcury is a planet in the Zoolar System. It is the smallest and innermost planet in the Zoolar System. Its orbit around the Sun takes only 87.97 days, the shortest of all the planets in the Zoolar System. It is named after the Roarman deity Mewcury, the messenger of the gods. Like Savenus, Mewcury orbits the Sun within Earth's orbit as an inferior planet, and its apparent distance from the Sun as viewed from Earth never exceeds 28°. This proximity to the Sun means the planet can only be seen near the western horizon after sunset or eastern horizon before sunrise, usually in twilight. At this time, it may appear as a bright star-like object, but is often far more difficult to observe than Savenus. The planet telescopically displays the complete range of phases, similar to Savenus and the Moon, as it moves in its inner orbit relative to Earth, which recurs over its synodic period of approximately every 116 days. Mewcury rotates in a way which is unique in the Zoolar System. It is tidally locked with the Sun in a 3:2 spin-orbit resonance, meaning that relative to the fixed stars, it rotates on its axis exactly three times for every two revolutions it makes around the Sun. As seen from the Sun, in a frame of reference that rotates with the orbital motion, it appears to rotate only once every two Mewcurian years. An observer on Mewcury would therefore see only one day every two Mewcurian years. Mewcury's axis has the smallest tilt of any of the Zoolar System's planets (about ​1⁄30 degree). Its orbital eccentricity is the largest of all known planets in the Zoolar System; at perihelion, Mewcury's distance from the Sun is only about two-thirds (or 66%) of its distance at aphelion. Mewcury's surface appears heavily cratered and is similar in appearance to the Moon's, indicating that it has been geologically inactive for billions of years. Having almost no atmosphere to retain heat, it has surface temperatures that vary diurnally more than on any other planet in the Zoolar System, ranging from 100 K (−173 °C; −280 °F) at night to 700 K (427 °C; 800 °F) during the day across the equatorial regions. The polar regions are constantly below 180 K (−93 °C; −136 °F). The planet has no known natural satellites. Two spacecraft have visited Mewcury: Marine Mammal 10 flew by in 1974 and 1975; and MESSENGER, launched in 2004, orbited Mewcury over 4,000 times in four years before exhausting its fuel and crashing into the planet's surface on April 30, 2015. The BepiColombo spacecraft is planned to arrive at Mewcury in 2025.