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Scientists have analized many other planetary systems throughout the Universe, and it seems that our Solar System isn’t so unique. Many other planetary systems have either less, equal, or even more planets than our Solar System. One interesting fact about our Solar System is that it lacks a specific type of planet called a Super-Earth.
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. The 9 Planets in Our Solar System
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 solar system consists of the Sun; the eight official planets, at least three “dwarf planets”, more than 130 satellites of the planets, a large number of small bodies (the comets and asteroids), and the interplanetary medium.
Kepler-444 System – This planetary system is among the oldest ever discovered, and it hosts five exoplanets, each of them being the size of the terrestrial planets in our Solar System. 55 Cancri e – This planet is very hot since it orbits its star 25 times closer than Mercury does with our Sun. HD 189733 b – This exoplanet is half the ...
There are 181 known moons in our Solar System which are orbiting planets and dwarf planets. Despite there being so many moons not every planet or dwarf planet has a moon. A table of planets and dwarf planets with the number of moons is below. Number of Moons by Planet
The main reason for the planets to vary their distance is due to elliptical orbits. No planet in our Solar System orbits the sun in a perfect circle which means that the distance between planets is never the same. For this reason, to calculate the distance, we use the average to measure how far planets are from one another.
The number of bodies in the solar system increased dramatically in the 19th century with the discovery of the asteroids (464 of which were known at by 1899) but only 9 more “major” bodies were discovered. The number of major bodies rose to 31 (almost double the 17th century total):
The terrestrial planets are the smallest in the Solar System. They are part of the inner solar system, being the closest to the Sun. The smallest terrestrial planet is Mercury. Mercury has a radius of 2.439 km / 1.516 mi and a diameter of 4.879 km / 3.032 mi. It is three times smaller than both Earth and Venus.
Dwarf planets are relatively small; for example, the largest dwarf planet in our Solar System, Pluto, is two times smaller than the smallest planet in our Solar System, Mercury. Pluto was considered a planet for a long time; however, after many other small planets were discovered, Pluto was classified as a dwarf planet.