Planet Mecury

The solar system includes a 9 planets. Planets areis a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
The term planet is ancient, with ties to history, science, mythology, and religion. The planets were originally seen by many early cultures as divine, or as emissaries of the gods. As scientific knowledge advanced, human perception of the planets changed, incorporating a number of disparate objects. In 2006, the International Astronomical Union officially adopted a resolution defining planets within the Solar System. This definition has been both praised and criticized, and remains disputed by some scientists.

is the innermost and smallest planet in the Solar System, orbiting the Sun once every 87.969 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 the 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. Mercury is bright when viewed from Earth, ranging from −2.0 to 5.5 in apparent magnitude, but is not easily seen as its greatest angular separation from the Sun is only 28.3°. Since Mercury is normally lost in the glare of the Sun, unless there is a solar eclipse, Mercury can only be viewed in morning or evening twilight.

More Info On Mercury
The planets in order

More Info On Mercury
Quick Facts
  • Diameter: 4,878km (3,032 miles) at its equator, which is about two-fifths of Earth's diameter.
  • Temperature: Is not exact but temp gets about 840 degrees
  • Orbit: 57,910,000 km (0.38 AU) from Sun. Orbiting the Sun once every 88 days.
  • Average Distance: About 58 million km (36 million miles)

  • Time to Rotate: 58.6 days

  • Mass: 3.30e23 kg (5.5% of Earth's)
  • Moons: 0
  • Period of Rotation: 58.6462 days
* Mercury actually has a very thin atmosphere consisting of atoms blasted off its surface by the solar wind. Because Mercury is so hot, these atoms quickly escape into space. Thus in contrast to the Earth and Venus whose atmospheres are stable, Mercury's atmosphere is constantly being replenished.
A diagram of Mercury

Bibliography (MLA Format)
World Book Scott fetcer, Crown publishers, Michigan, 2006