The Nine Planets is an encyclopedic overview with facts and information about mythology and current scientific knowledge of the planets, moons, and other objects in our solar system and beyond.

Dec 6, 2019 · The Planets of the Solar System Detailed information and facts about the eight planets and five dwarf planets in our solar system.

The gas planets are composed primarily of hydrogen and helium and generally have low densities, rapid rotation, deep atmospheres, rings and lots of satellites. by size: small planets: Mercury, Venus, Earth, Mars. The small planets have diameters less than 13000 km. giant planets: Jupiter, Saturn, Uranus and Neptune.

Mar 17, 2020 · The planets of our Solar System are listed based on their distance from the Sun. There are, of course, the dwarf planets Ceres, Pluto, Haumea, Makemake, and Eris; however, they are in a different class. Among the dwarf planets, Pluto was listed as a planet the longest. This all changed in 2006 when the Astronomical Union – IAU – finally ...

The Nine Planets is a collection of information about our Solar System intended for a general audience with little technical background. No special expertise or knowledge is needed; all technical and astronomical terms and proper names are defined in the glossary.

Sep 29, 2020 · The eight planets in our Solar System, in order from the Sun, are the four terrestrial planets Mercury, Venus, Earth, and Mars, followed by the two gas giants Jupiter and Saturn, and the ice giants Uranus and Neptune. These are the eight planets of our Solar System; however, there is a ninth, or at least, there used to be a ninth planet, namely ...

Sep 25, 2019 · Mercury's axis has the smallest tilt of any of the Solar System's planets at about 1 ⁄ 30 degrees, while its orbital eccentricity is the largest of all known planets in the Solar System. Mercury's distance from the Sun is only about two-thirds or 66%, of its distance at aphelion, at its aphelion it is 0.44 AU away from the Sun.

Sep 25, 2019 · So by this official definition there are exactly eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Pluto, Ceres and Eris (aka 2003 UB313) are “dwarf planets” with a potentially large number of additional objects falling into this category in the near future. planitia low plain. planum plateau or high plain.

Terrestrial Planets Composition. The terrestrial planets Mercury – Venus – Earth – Mars, are mostly made up of rock and metal. These planets are very heavy and move slowly. They have a solid surface, unlike the gas or ice giants. The terrestrial planets have a central metallic core composed mostly of iron, with a surrounding silicate mantle.

Sep 25, 2019 · The 17th Century. In 1610 when Galileo first turned a telescope on the heavens and our knowledge of the universe exploded.