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...possibility of rapid, unmanned [[Interstellar travel|travel to nearby star systems]]. ...d Disk dM Stars: Magnetic Activity, Light Variations, XUV Irradiances, and Planetary Habitable Zones | year=2005 | month=May ...

The '''[[Planetary ring|rings]] of [[Neptune]]''' were discovered in 1989 by the ''[[Voyager 2 ...th1989" /> As a whole, the Neptunian rings resemble those of Jupiter; both systems consist of faint narrow dusty ringlets and even more faint broad dusty ring ...

...1734/> Originally applied only to our own [[Solar System]], this method of planetary system formation is now thought to be at work throughout the [[universe]].< ...n circumstances, which are not well known. Thus the formation of planetary systems is thought to be a natural result of star formation. A sun-like star usuall ...

...d face far more [[impact event]]s than the Earth. Despite this hurdle to [[Planetary habitability|habitability]], its "[[solar analog]]" (Sun-like) characterist ...t-year]]s. This makes it [[List of nearest stars|one of the closest]] star systems to the Sun, and the next-closest [[Stellar classification#Class G|spectral ...

...rbit_radius = 1&nbsp;070&nbsp;400&nbsp;km<ref name=orbit>{{cite web|title=Planetary Satellite Mean Orbital Parameters|publisher=Jet Propulsion Laboratory, Cali ...name=jplfact>{{cite web|last=Yeomans|first=Donald K.|date=2006-07-13|title=Planetary Satellite Physical Parameters|publisher=JPL Solar System Dynamics|url=http: ...

...tific disciplines including [[astronomy]], [[physics]], [[geology]], and [[planetary science]]. Since the dawn of the [[space age]] in the 1950s and the discove ...often shifted, and planets have switched places.<ref name="Gomes"/> This [[planetary migration]] now is believed to have been responsible for much of the Solar ...

...rticle is about the Sun and its planetary system. For other systems, see [[Planetary system]] and [[Star system]]. For a list of the physical attributes of the ...moons" after Earth's [[Moon]]. Each of the outer planets is encircled by [[planetary ring]]s of dust and other particles. ...

...tar, whether a planet orbiting this star could [[Habitability of red dwarf systems|support life]] is disputed.<ref name=tarter/><ref name=Khodachenko/> Becaus | url=http://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html ...

== Planetary system == ...t of [[comet]]s or [[meteor]]s, and may be evidence for the existence of a planetary system.<ref>{{cite web ...

...J2000]] epoch. Barycentre quantities are given because, in contrast to the planetary centre, they do not experience appreciable changes on a day-to-day basis fr | url = http://nssdc.gsfc.nasa.gov/planetary/factsheet/neptunefact.html ...

...-11:42:58-->|title=Dwarf Planets and their Systems|work= Working Group for Planetary System Nomenclature (WGPSN)|url=http://planetarynames.wr.usgs.gov/append7.h ...essdate=2008-07-14}}</ref> On July 11, 2008, the IAU/USGS Working Group on Planetary Nomenclature included Makemake in the plutoid class, making it officially b ...

...://www.chara.gsu.edu/RECONS/TOP100.posted.htm The One Hundred Nearest Star Systems], Todd J. Henry, RECONS, April 11, 2007. Accessed on line May 4, 2007.</re ...], April 17, 2007.</ref> appear to have been formed by mass loss in binary systems. ...

| author=Staff | title =White Dwarfs & Planetary Nebulas .../ref> This ejected material formed an immense cloud of material called a [[planetary nebula]]. All but a small fraction of the hydrogen envelope was driven awa ...

...nd colonize first their own [[star system]], and then the surrounding star systems. As there is no conclusive or certifiable evidence on Earth or elsewhere in ...umes that civilizations arise and then die out within their original solar systems. If interstellar colonization is possible, then this assumption is invalid ...

| work=Gazetteer of Planetary Nomenclature | journal=Meteoritics & Planetary Science | year=2000 ...

[[Binary star|Binary]] and multi-star systems consist of two or more stars that are gravitationally bound, and generally | title=Are any of the nebulæ star-systems? | journal=Nature ...

| work=Twelve Year Planetary Ephemeris: 1995-2006, NASA Reference Publication 1349 | work=Twelve Year Planetary Ephemeris: 1995-2006, NASA Reference Publication 1349}}</ref> Sirius can be ...

...rdinate system]] can yield only ''d'' constants of motion, superintegrable systems must be separable in more than one coordinate system.<ref>{{cite book | las Maximally superintegrable systems follow closed, one-dimensional orbits in [[phase space]], since the orbit i ...

...ory; mathematically speaking, the Newtonian connection is not [[integrable systems|integrable]]. From this, one can deduce that spacetime is [[curved]]. The ...have been indirectly observed through the loss of energy in binary pulsar systems such as the [[Hulse-Taylor binary]], the subject of the 1993 Nobel Prize in ...

...s how Archimedes designed [[block and tackle|block-and-tackle]] [[pulley]] systems, allowing sailors to use the principle of [[leverage]] to lift objects that ...[[asteroid]] [[3600 Archimedes]] is named after him.<ref>{{cite web |title=Planetary Data System |author= |publisher=NASA |url=http://starbrite.jpl.nasa.gov/pds ...