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'''Space travel under constant acceleration''' is a hypothetical method of [[Spaceflight|space travel]] that involves the use of a [[propuls ...environment as the ship passes through it (the sailing ship approach). One hypothetical sailing ship approach is discovering something equivalent to the [[parallel ...

...Segransan|title=The HARPS search for southern extra-solar planets. XIII. A planetary system with 3 Super-Earths (4.2, 6.9, & 9.2 Earth masses)|journal=[[Astrono ...at the [[metallicity|metallicities]] of stars determine whether or not the planetary bodies that orbit them will be terrestrial, like Earth, or gaseous, like [[ ...

== Planetary system == [[Category:Hypothetical planetary systems]] ...

...tems |url=https://astrobiology.com/2024/09/the-habitability-of-f-type-star-systems.html |access-date=2024-09-21 |website=Astrobiology |language=en-US}}</ref> ..."Borgniet2017"/> The net result was an estimate of a 4.52 {{Jupiter mass}} planetary companion orbiting the star at a distance of 1.82 AU with an eccentricity o ...

...nd cooler than all but one imaged [[brown dwarf]] (the exception being the planetary-mass [[WISE 0855−0714]]).<ref name="JWSTImages2024-07-24" /> It is predicte ...] of Epsilon Indi by Endl et al. appeared to show a trend that indicated a planetary companion with an orbital period of more than 20 years. A substellar object ...

{{Short description|Hypothetical spacecraft propulsion concept using external force fields momentum for tran ...ber 30, 2022}}</ref> are examples of such electromagnetic Field propulsion systems, first described in 1994.<ref>{{Cite patent|country=US|number=5333444|pubda ...

...To avoid interference with local life, the targets may be young planetary systems where local life is unlikely. Directed panspermia can be motivated by [[bio ...estroyed, send microscopic "seeds of a new humanity" towards potentially [[Planetary habitability|habitable]] areas of the universe.<ref>{{cite book| last=Stapl ...

...ole of phosphates for the Lu–Hf chronology of meteorites|journal=Earth and Planetary Science Letters|volume=473|pages=52–61|doi=10.1016/j.epsl.2017.05.039|bibco ...ications for the bulk composition of terrestrial planets|journal=Earth and Planetary Science Letters|volume=273|issue=1–2 |pages=48–57|doi=10.1016/j.epsl.2008.0 ...

...f name="Choi" /> There is no reason to believe comets formed in other star systems would not be similarly scattered.<ref name="Valtonen" /> [[Amir Siraj]] and ...Solar System confirms the possibility of a material link with exoplanetary systems. ...

...d mathematical modeling of orbits began with the first attempts to predict planetary motions in the sky, although in ancient times the causes remained a mystery The complex motions of orbits can be broken down. The hypothetical motion that the body follows under the gravitational effect of one other bo ...

...has an estimated mass between 3–10 [[Jupiter mass]]es, which makes it a [[planetary-mass object]] below the 13 Jupiter mass limit for [[deuterium fusion]]. ...e object's unusually high [[proper motion]] while searching for [[Nemesis (hypothetical star)#Past, current, and pending searches for Nemesis|potential binary comp ...

...that can generate either [[thrust]] or [[aerodynamic drag|drag]] from a [[planetary magnetic field]], in much the same way as an [[electric motor]] does. ...exchange tethers can be used for [[orbital maneuver]]ing, or as part of a planetary-surface-to-orbit / orbit-to-escape-velocity space transportation system. ...

...cite book|last=Dreyer|first=John Louis Emil|title=History of the planetary systems from Thales to Kepler|year=1906|page=42|quote=To complete the number ten, P ...[celestial sphere]]. However, this did not suffice to explain the observed planetary motion. ...

...d the [[Kuiper belt]], most commonly referred to as [[Planet Nine]]. This hypothetical new planet would be located so far from the Sun that it would reflect only ...y 341&nbsp;[[Astronomical unit|au]], being one of three brown dwarf binary systems where both objects are easily resolved by ground-based telescopes. The syst ...

{{Short description|Hypothetical Solar System planet}} {{About|the hypothetical planet first suggested in 2014|the dwarf planet previously classified as th ...

...lly leave the Solar System and continue into [[interstellar space]]. Its [[planetary system]] of origin and age are unknown. ...nal |title=Ejection of Material—'Jurads'—from Post-main-sequence Planetary Systems |journal=Research Notes of the American Astronomical Society |first1=Brad | ...

...sities]] and scientific supply companies. Each of the major stable isotope systems ([[hydrogen]], [[carbon]], [[oxygen]], [[nitrogen]], and [[sulfur]]) has a ....|title=Absolute18O content of standard mean ocean water|journal=Earth and Planetary Science Letters|volume=31|issue=3|pages=341–344|doi=10.1016/0012-821x(76)90 ...

...ernor]]s, and [[centrifugal clutch]]es, and in [[centrifugal railway]]s, [[planetary orbit]]s and [[banked curve]]s, when they are analyzed in a [[Inertial refe ...istant stars relative to the local inertial frame gives rise through some (hypothetical) physical law to the centrifugal force and other inertia effects. Today's v ...

...inline">L</math> within that space called a '''''Lagrangian'''''. For many systems, {{nowrap|1=''L'' = ''T'' − ''V''}}, where ''T'' and ''V'' are the [[Kineti ...ncept of forces are the usual starting point for teaching about mechanical systems.<ref name=Ball2019>{{Cite journal |last=Ball |first=Philip |date=2019-09-13 ...

! Uncertain status (inconsistency in age or mass of planetary system) ...st15=Jacques |date=2016-08-01 |title=NOMINAL VALUES FOR SELECTED SOLAR AND PLANETARY QUANTITIES: IAU 2015 RESOLUTION B3 * † |journal=The Astronomical Journal |v ...