All articles starting with P
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Planet Zoo 2
Planet Zoo 2 is Frontier Developments' zoo management simulation, released 13 October 2026 on PC, PS5, and Xbox Series X|S. It adds aquariums with aquatic species, aviaries with flying birds, Wildlife Reserves, and heavier management than the 2019 original.
Planet42
Planet42 is an Estonian car-subscription fintech founded in 2017 by Eerik Oja and Marten Orgna, leasing cars in South Africa and Mexico to customers banks reject.
Planetarium
A planetarium is a theater with a hemispherical dome on which the motions of stars, the sun, moon, and planets are projected, often for science education.
Planetarium (film)
Planetarium (Planétarium) is Rebecca Zlotowski's 2016 French-Belgian supernatural drama starring Natalie Portman and Lily-Rose Depp as medium sisters in 1930s Paris, premiered out of competition at Venice 2016.
Planetary and Space Science (journal)
Planetary and Space Science (ISSN 0032-0633) is an Elsevier peer-reviewed planetary science journal founded in 1959 under Pergamon Press, edited by Maria Cristina De Sanctis, hybrid access with a USD 3,460 APC, SCIE/Scopus-indexed, JCR Q3.
Planetary boundaries
Planetary boundaries: a 2009 Stockholm Resilience Centre framework defining safe limits for nine Earth-system processes; six of nine were transgressed by 2023 and seven by 2025, with Earth Commission safe and just boundaries extending the concept.
Planetary boundary layer
The planetary boundary layer, or atmospheric boundary layer, is the turbulent layer of the atmosphere adjacent to Earth's surface, typically about 1 km deep, where friction affects wind and temperature.
Planetary core
A planetary core is the iron-rich central region of a differentiated planet, formed when dense metal sank from the silicate mantle during the body's earliest evolution.
Planetary differentiation
Planetary differentiation is the process by which gravity separates a planet's molten interior into layers of different density: a dense metal core, a silicate mantle, and a crust.
Planetary engulfment
Planetary engulfment is the consumption of a planet by its host star when the star expands or dynamics drive the planet inward, leaving chemical signatures.
Planetary habitability
Planetary habitability is the study of whether a planetary body can sustain life, extrapolated from Earth and centered on the habitable zone where liquid water can exist.
Planetary migration
Planetary migration is the drift of a forming planet's semi-major axis from tidal interaction with its protoplanetary disk; models like the Nice model explain the Solar System's giant planets.
Planetary mnemonic
A planetary mnemonic is a sentence whose word initials encode the planets in order from the Sun, such as "My Very Educated Mother Just Served Us Noodles."
Planetary nebula
A planetary nebula is a glowing shell of gas ejected by a dying low- or intermediate-mass star, illuminated by the hot core left behind, which becomes a white dwarf.
Planetary nomenclature
Planetary nomenclature is the IAU-approved system of names for surface features on planets, moons, and small bodies, with 15,941 names in use as of 2024.
Planetary objects proposed in religion, astrology, ufology and pseudoscience
Planetary objects proposed in religion, astrology, ufology and pseudoscience, also called planets in religion, ufology and mythology, are unconfirmed bodies like Vulcan, Planet X, and Nibiru.
Planetary parade
A planetary parade is a popular, non-technical name for several planets appearing in Earth's sky at once along a line or arc, a line-of-sight effect along the ecliptic.
Planetary radar
Planetary radar is the study of Solar System bodies, from the Moon to asteroids and comets, by transmitting radio signals and analyzing the returning echoes with large Earth-based dishes.
Planetary system
A planetary system, also known as an extrasolar system, is a set of gravitationally bound objects, including planets, that orbit a star; our solar system formed 4.6 billion years ago.
Planetes (プラネテス)
Planetes (プラネテス) is a hard science fiction manga by Makoto Yukimura, serialized from 2000, about working-class astronauts who collect hazardous space debris in Earth orbit.
Planetesimal
A planetesimal is a kilometer-sized rocky or icy body that forms by dust coagulation in a protoplanetary disk and accretes into planets; asteroids and comets are surviving remnants.
PlanetLab
PlanetLab is a global network of computers used as a testbed for networking and distributed systems research. Established in 2002, it is hosted by universities and corporations worldwide.
PlanetQuest
PlanetQuest is a NASA Jet Propulsion Laboratory public engagement program on the search for planets around other stars, best known for founding the Night Sky Network in 2004.
Planets beyond Neptune
Planets beyond Neptune are hypothetical massive bodies, including the proposed Planet Nine, inferred from the clustered orbits of distant icy objects; only Pluto was ever found, in 1930.
Planets in astrology
In astrology, the planets are the Sun, the Moon, and the solar system bodies, treated as symbolic forces whose chart positions are read as influences on personality and events.
PlanetSide 2
PlanetSide 2: free-to-play MMOFPS launched November 20, 2012 by Sony Online Entertainment, now under Toadman Interactive. Three factions (Terran Republic, New Conglomerate, Vanu Sovereignty) fight for Auraxis across four 8x8 km continents on the ForgeLight engine.
PlanGrid
PlanGrid is a San Francisco construction software company founded in 2011, whose mobile app let contractors view and mark up project plans; Autodesk acquired it in 2018.
Planimeter
A planimeter is a mechanical instrument that measures the area of a plane shape by tracing its perimeter with a pointer; Jacob Amsler's polar design of 1854 became standard.
Planimetry (medicine)
Planimetry is a clinical method that measures the surface area of wounds, ulcers, burns, and skin lesions from traced or photographed outlines to track healing.
Planine
Planine is a pastoral and allegorical romance by the Croatian Renaissance writer Petar Zoranić, written in 1536 and printed in Venice in 1569, generally regarded as the first Croatian novel.