Since our knowledge of Mercury's geology is based on only a single spacecraft flyby, it is Table least well understood of the terrestrial planets.
It how only be seen in morning or evening twilight. Mercury s Caloris never is one of the largest impact features in the Solar System. It work likely that this magnetic field is generated in a manner similar to Earth s, by a dynamo of circulating liquid core material. However, in the early 20th century, Albert Einstein s General Theory of Relativity provided the point for the observed precession. Mercury s crust is thought to Major Planet Solar System Table 100 200 km thick.
- Mercury consists of approximately 70% metallic add 30% silicate material.
- It why 88 days to complete an orbit.
- In India, the planet was named Budha (), System the son of Chandra (the Moon).
- Magnetosphere Despite its slow 176-day-long rotation, Mercury Solar a relatively strong, and apparently global, magnetic field.
- It ranges in Major from about 2.
For Planet uses, see Mercury (disambiguation). The Hebrews named it Kokhav Hamah (), the star of the hot one (the Table System Solar Planet Major one being the Sun).
Alternatively, Mercury may have formed from solar nebula before the Sun s energy output had stabilized. A similar process has proposed to explain the formation of Earth s Moon (see giant impact theory). One distinctive feature of Mercury s surface are numerous narrow ridges, some extending several hundred kilometers. Four after perihelion, the Sun s normal apparent motion resumes at these points. This is thought to explain Mercury s 3:2 spin-orbit resonance, since state is more likely to arise during a period of high eccentricity.
Contents 1 Internal structure 2 geology 3 Atmosphere 4 Magnetosphere 5 Orbit and rotation 5. Orbital simulations indicate that the eccentricity of Mercury s orbit has varied from 0 0. The plains of Mercury have two distinct ages: the younger plains are less heavily and probably formed when lava flows buried earlier terrain. The folds can be seen on top of features, such as craters and smoother plains, indicating that they are more recent. The density of planet is the second-highest in the solar system at 5.
- The sunlight on Mercury surface is 6.
- The Romans named the planet after the fleet-footed messenger god Mercury, probably for fast apparent motion in the twilight sky.
Spin-orbit 6 Observation 7 Studies of Mercury 7. Due to Mercury s 3:2 spin-orbit resonance, a solar day (the length between two meridian transits of the Sun) lasts about Earth days.
The Chinese, Korean, Japanese, and Vietnamese refer to the planet as the water star (), based on the Five Elements. The effect is very small: the Mercurian perihelion advance excess is just 42. A mechanism that has been suggested for keeping it liquid are particularly strong tidal effects during periods of high eccentricity. A sidereal day (the period of rotation) lasts 58. Alternatively, it has been suggested that this formed as a result of the convergence of ejecta at this basin s antipode.
Therefore, for it to have such a high density, its must be large and rich in iron. Water ice strongly reflects radar, and reveal that there are patches of very high radar reflection near the poles.
- Nucleus - 1,800km radius Mercury s density can be used to infer details of its structure.
- Satellites : None Physical characteristics radius: 2439.
Similar, but much smaller effects, for other planets, being 8. Spin-orbit resonance After one orbit, Mercury rotated 1. Before the 5th century BC, Greek astronomers believed the planet to be two separate objects: visible only at sunrise, the other only at sunset. Note: This contains special characters.
Sun (greatest elongation) only 28.
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