About Mercury Planet
Mercury is the innermost and smallest planet in the Solar System, orbiting the Sun once every 87. 969 Earth days. The orbit of Mercury has the highest eccentricity of all the Solar System planets, and it has the smallest axial tilt. It completes three rotations about its axis for every two orbits. The perihelion of Mercury ‘ s orbit precesses around the Sun at an excess of 43 arcseconds per century, a phenomenon that was explained in the 20th century by Albert Einstein ‘ s General Theory of Relativity. About Mercury Planet
Mercury is shimmering when viewed from Earth, ranging from – 2. 3 to 5. 7 in apparent magnitude, but is not succulent practical for its greatest angular separation from the Sun is matchless 28. 3°. Since Mercury is normally missed in the identify of the Sun, unless known is a solar go underground it liability serve viewed only for short intervals before sunrise when it is near its maximal western elongation, or following sundown when near its consummate eastern elongation. At relatively alpine latitudes comparable over those of alive with European and North American body politic centres, it is stable therefore near the horizon and invisible in a relatively auroral twilit sky. However, at sweltry and subtropical latitudes, Mercury is added young pragmatic seeing of two effects.
The Sun ascends ultra the horizon other steeply at sunrise and descends bounteous steeply at evening, for the twilight interval is shorter, and at the hold water times of extent, the Ecliptic intersects the horizon at a very steep angle, meaning that Mercury can be relatively high ( altitude up to 28° ) in a fully dark sky. Such conditions can pertain, for instance, after sunset near the Spring Equinox, in March / April for the southern USA and in September / October for South Africa and Australasia. Conversely, pre – sunrise viewing is easiest near the Autumn Equinox. About Mercury Planet
Comparatively little is known about Mercury; ground – based telescopes reveal only an illuminated crescent with limited detail. The first of two spacecraft to visit the planet was Mariner 10, which mapped about 45 % of its surface from 1974 to 1975. The second is the MESSENGER spacecraft, which attained orbit around Mercury on March 17, 2011, to map the rest of the planet.
Video Mercury Planet
About Mercury Planet
Mercury is similar in appearance to the Moon: it is heavily cratered with regions of smooth plains, has no natural satellites and no substantial atmosphere. Unlike the Moon, it has a large iron core, which generates a magnetic field about 1 % as strong as that of the Earth. It is an exceptionally dense planet due to the large relative size of its core. Surface temperatures range from about 90 to 700 K ( – 183 °C to 427 °C ), with the subsolar point being the hottest and the bottoms of craters near the poles being the coldest.
Recorded observations of Mercury date back to at least the first millennium BC. Before the 4th century BC, Greek astronomers believed the planet to be two separate objects: one visible only at sunrise, which they called Apollo; the other visible only at sunset, which they called Hermes. The English name for the planet comes from the Romans, who named it after the Roman god Mercury, which they equated with the Greek Hermes (?? µ?? ). The astronomical symbol for Mercury is a stylized version of Hermes ‘ caduceus. About Mercury Planet
Source: Wikipedia and various sources