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Planetary Scientists
Planetary means relating to a planet or planets. It can also refer to: Science * Planetary habitability, the measure of an astronomical body's potential to develop and sustain life * Planetary nebula, an astronomical object People * Planetary (rapper), one half of east coast rap group OuterSpace Arts, entertainment, and media * ''Planetary'' (comics), a comic book series by Warren Ellis and John Cassaday * "Planetary (Go!)", a 2011 song by rock band My Chemical Romance * ''Planetary Radio'', a public radio show about space exploration, produced by The Planetary Society Organizations * The Planetary Society, the Earth's largest space interest group Technology * Epicyclic gearing An epicyclic gear train (also known as a planetary gearset) is a gear reduction assembly consisting of two gears mounted so that the center of one gear (the "planet") revolves around the center of the other (the "sun"). A carrier connects the ... (planetary gearing), an automotive transmission te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planet
A planet is a large, Hydrostatic equilibrium, rounded Astronomical object, astronomical body that is generally required to be in orbit around a star, stellar remnant, or brown dwarf, and is not one itself. The Solar System has eight planets by the most restrictive definition of the term: the terrestrial planets Mercury (planet), Mercury, Venus, Earth, and Mars, and the giant planets Jupiter, Saturn, Uranus, and Neptune. The best available theory of planet formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary disk. Planets grow in this disk by the gradual accumulation of material driven by gravity, a process called accretion (astrophysics), accretion. The word ''planet'' comes from the Greek () . In Classical antiquity, antiquity, this word referred to the Sun, Moon, and five points of light visible to the naked eye that moved across the background of the stars—namely, Me ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planetary Habitability
Planetary habitability is the measure of a planet's or a natural satellite's potential to Abiogenesis, develop and sustain an environment hospitable to life. Life may be abiogenesis, generated directly on a planet or satellite endogenously. Research suggests that life may also be transferred from one body to another, through a hypothetical process known as panspermia. Environments do not need to contain life to be considered habitable nor are accepted habitable zones (HZ) the only areas in which life might arise. As the existence of life beyond Earth is not known, planetary habitability is largely an extrapolation of conditions on Earth and the characteristics of the Sun and Solar System which appear favorable to life's flourishing. Of particular interest are those factors that have sustained complex, multicellular organisms on Earth and not just simpler, unicellular creatures. Research and theory in this regard is a component of a number of natural sciences, such as astronomy, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planetary Nebula
A planetary nebula is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives. The term "planetary nebula" is a misnomer because they are unrelated to planets. The term originates from the planet-like round shape of these nebulae observed by astronomers through early telescopes. The first usage may have occurred during the 1780s with the English astronomer William Herschel who described these nebulae as resembling planets; however, as early as January 1779, the French astronomer Antoine Darquier de Pellepoix described in his observations of the Ring Nebula, "very dim but perfectly outlined; it is as large as Jupiter and resembles a fading planet". Though the modern interpretation is different, the old term is still used. All planetary nebulae form at the end of the life of a star of intermediate mass, about 1-8 solar masses. It is expected that the Sun will form a planetary nebula at the end of i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planetary (rapper)
Mario Collazo (born August 8, 1978), better known by his stage name Planetary, is an American underground rapper from Philadelphia, Pennsylvania. He is one half of the rap duo OuterSpace and a member of Army of the Pharaohs. Biography Early career (1995-1999) Planetary started rapping with high school friends Marcus Albaladejo and Richard Cruz. The trio later went on to form the group OuterSpace. The group originally started to form in the early 90s and eventually lead to an alliance with fellow Philadelphians Jedi Mind Tricks and their label Superegular Recordings. In 1998, Superegular released their debut single "We Lyve" which was met with critical praise for its complex, scientific rhymes and ethereal, seemingly other-worldly beats. Outerspace appeared on several JMT tracks and on the Illegaliens EP released in 1999 on the Wordsound label. Soon thereafter, Outerspace hooked up with DJ SAT ONE and began recording with Jazzy Jeff's production company A Touch of Jazz. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planetary (comics)
''Planetary'' is an American comic book series created by writer Warren Ellis and artist John Cassaday, and published by the Wildstorm imprint of DC Comics. After an initial preview issue in September 1998, the series ran for 27 issues from April 1999 to October 2009. Publication history ''Planetary'' was previewed in issue #33 of '' Gen13'' and issue #6 of ''C-23'', both dated September 1998. The first issue of the series was cover-dated April 1999. Originally intended to be a 24-issue bi-monthly series, the series was on hold from 2001 to 2003 due to illness of writer Warren Ellis and other commitments by Cassaday. Laura Martin (also credited as Laura DePuy) colored almost every issue of the series. The main story concluded with issue #26 in October 2006; the concluding issue #27 released three years later in October 2009. Ellis intended the focus of the book to be the superhero genre, rather than the superheroes themselves: "I wanted to do something that actually went deeper ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planetary (Go!)
"Planetary (Go!)" (stylized as "Planetary (GO!)") is a song by the American rock band My Chemical Romance from their fourth studio album, '' Danger Days: The True Lives of the Fabulous Killjoys'' (2010). A dance-punk, electropop, power pop, and punk funk song, "Planetary (Go!)" was conceived after the band began experimenting with synthesizers due to long wanting to write a dance song. The track was written by band members Frank Iero, Ray Toro, Gerard Way, and Mikey Way, and was produced by the band alongside Rob Cavallo. "Planetary (Go!)" was announced to be released as a single on March 21, 2011, with a music video featuring a live performance of the song being released on that day; however, the single was ultimately released for digital download and streaming on the 25th. The track received divided reviews from music critics, with some regarding it as an album highlight while others criticized its sound and lyrics. "Planetary (Go!)" was notably included as the opening son ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Planetary Society
The Planetary Society is an American internationally-active non-governmental nonprofit organization. It is involved in research, public outreach, and political space advocacy for engineering projects related to astronomy, planetary science, and space exploration. It was founded in 1980 by Carl Sagan, Bruce Murray, and Louis Friedman, and has about 60,000 members from more than 100 countries around the world. The Society is dedicated to the exploration of the Solar System, the search for near-Earth objects, and the search for extraterrestrial life. The society's mission is stated as: "Empowering the world’s citizens to advance space science and exploration." The Planetary Society is a strong advocate for space funding and missions of exploration within NASA. They lobby Congress and engage their membership in the United States to write and call their representatives in support of NASA funding. In addition to public outreach, The Planetary Society has sponsored solar sai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epicyclic Gearing
An epicyclic gear train (also known as a planetary gearset) is a gear reduction assembly consisting of two gears mounted so that the center of one gear (the "planet") revolves around the center of the other (the "sun"). A carrier connects the centers of the two gears and rotates, to carry the planet gear(s) around the sun gear. The planet and sun gears mesh so that their pitch circles roll without slip. If the sun gear is held fixed, then a point on the pitch circle of the planet gear traces an epicycloid curve. An epicyclic gear train can be assembled so the planet gear rolls on the inside of the pitch circle of an outer gear ring, or ring gear, sometimes called an ''annulus gear''. Such an assembly of a planet engaging both a sun gear and a ring gear is called a planetary gear train.J. J. Uicker, G. R. Pennock and J. E. Shigley, 2003, ''Theory of Machines and Mechanisms,'' Oxford University Press, New York.B. Paul, 1979, ''Kinematics and Dynamics of Planar Machinery'', Pre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
