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A planetary mnemonic refers to a phrase created to remember the planets and dwarf planets of the Solar System, with the order of words corresponding to increasing sidereal periods of the bodies. One simple visual mnemonic is to hold out both hands side-by-side with thumbs in the same direction (typically left-hand facing palm down, and right ...
[f] Six planets, seven dwarf planets, and other bodies have orbiting natural satellites, which are commonly called 'moons'. The Solar System is constantly flooded by the Sun's charged particles, the solar wind, forming the heliosphere. Around 75–90 astronomical units from the Sun, [g] the solar wind is halted, resulting in the heliopause.
There are eight planets within the Solar System; planets outside of the solar system are also known as exoplanets. Artist's concept of the potentially habitable exoplanet Kepler-186f As of 24 January 2025, there are 5,830 confirmed exoplanets in 4,354 planetary systems , with 976 systems having more than one planet . [ 1 ]
The last time all eight planets were aligned was on Dec. 28, 2022. On Jan. 18, 2025, there will be six planets in the alignment: Mercury, Mars, Jupiter, Uranus, Neptune and Saturn.
The Sun and planets of the Solar System (distances not to scale). The Solar System is the gravitationally bound system of the Sun and the objects that orbit it. It formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc.
The Sun, planets, moons and dwarf planets (true color, size to scale, distances not to scale) The following outline is provided as an overview of and topical guide to the Solar System: Solar System – gravitationally bound system comprising the Sun and the objects that orbit it, either directly or indirectly. Of those objects that orbit the ...
The acronyms listed below were placed into one or more of these categories: Astrophysics terminology – physics-related acronyms; Catalog – collections of tabulated scientific data; Communications network – any network that functions primarily to communicate with spacecraft rather than performing astronomy
All eight exoplanets are larger than Earth and are within 1.1 AU of the parent star. Only star apart from the Sun with at least eight planets. [142] A Hill stability test shows that the system is stable. [143] Planet h orbits in the habitable zone. Kepler-150: Lyra: 19 h 12 m 56.2 s +40° 31′ 15″ 2906: G?V: 0.97: 5560: unknown: 5: Planet f ...