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Planets That Can Support Life in Our Solar System

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Measure of the potential of natural satellites to have environments hospitable to life

The habitability of natural satellites is a measure of the potential of natural satellites to take environments hospitable to life.[1] Habitable environments do not necessarily harbor life. Natural satellite habitability is an emerging field which is considered important to astrobiology for several reasons, foremost being that natural satellites are predicted to profoundly outnumber planets and it is hypothesized that habitability factors are likely to be similar to those of planets.[2] [3] There are, yet, key environmental differences which have a begetting on moons as potential sites for extraterrestrial life.

The strongest candidates for natural satellite habitability are currently icy satellites[4] such as those of Jupiter and Saturn—Europa[five] and Enceladus[6] respectively, although if life exists in either place, it would probably be confined to subsurface habitats. Historically, life on World was thought to be strictly a surface phenomenon, but recent studies have shown that upwardly to half of Earth'due south biomass could live below the surface.[seven] Europa and Enceladus exist outside the circumstellar habitable zone which has historically defined the limits of life within the Solar Arrangement as the zone in which water tin can exist equally liquid at the surface. In the Solar Arrangement's habitable zone, there are only three natural satellites—the Moon, and Mars's moons Phobos and Deimos (although some estimates testify Mars and its moons to be slightly exterior the habitable zone)[8] —none of which sustain an atmosphere or water in liquid form. Tidal forces are likely to play as meaning a role providing rut as stellar radiation in the potential habitability of natural satellites.[9] [10]

Exomoons are not yet confirmed to exist. Detecting them is extremely difficult, because current methods are limited to transit timing.[xi] It is possible that some of their attributes could be determined by like methods as those of transiting planets.[12] Despite this, some scientists estimate that there are as many habitable exomoons as habitable exoplanets.[two] [13] Given the general planet-to-satellite(s) mass ratio of 10,000, large Saturn or Jupiter sized gas planets in the habitable zone are idea to be the all-time candidates to harbour Earth-like moons.[14]

Presumed conditions [edit]

The conditions of habitability for natural satellites are similar to those of planetary habitability. Withal, at that place are several factors which differentiate natural satellite habitability and additionally extend their habitability outside the planetary habitable zone.[15]

Liquid water [edit]

Liquid water is thought past most astrobiologists to be an essential prerequisite for extraterrestrial life. There is growing prove of subsurface liquid water on several moons in the Solar System orbiting the gas giants Jupiter, Saturn, Uranus, and Neptune. However, none of these subsurface bodies of water has been confirmed to date.

Orbital stability [edit]

For a stable orbit the ratio betwixt the moon's orbital period P due south around its chief and that of the master around its star P p must be < 1⁄ix , east.g. if a planet takes 90 days to orbit its star, the maximum stable orbit for a moon of that planet is less than 10 days.[16] [17] Simulations suggest that a moon with an orbital flow less than nearly 45 to 60 days will remain safely leap to a massive giant planet or chocolate-brown dwarf that orbits 1 AU from a Sun-like star.[xviii]

Temper [edit]

An atmosphere is considered by astrobiologists to be important in developing prebiotic chemistry, sustaining life and for surface water to exist. Most natural satellites in the Solar System lack pregnant atmospheres, the sole exception being Saturn's moon Titan.[19]

Sputtering, a process whereby atoms are ejected from a solid target material due to battery of the target by energetic particles, presents a significant problem for natural satellites. All the gas giants in the Solar Organization, and probable those orbiting other stars, have magnetospheres with radiation belts potent plenty to completely erode an atmosphere of an Earth-like moon in simply a few hundred million years. Stiff stellar winds can also strip gas atoms from the top of an atmosphere causing them to exist lost to space.

To back up an World-like atmosphere for about 4.half dozen billion years (Earth'southward current age), a moon with a Mars-similar density is estimated to need at least seven% of Earth's mass.[twenty] 1 way to subtract loss from sputtering is for the moon to have a strong magnetic field of its own that tin can deflect stellar air current and radiation belts. NASA'due south Galileo's measurements suggest that big moons tin can have magnetic fields; it found Ganymede has its ain magnetosphere, even though its mass is but ii.5% of Globe's.[18] Alternatively, the moon's atmosphere may be constantly replenished by gases from subsurface sources, as idea by some scientists to exist the case with Titan.[21]

Tidal furnishings [edit]

While the furnishings of tidal acceleration are relatively modest on planets, it can be a significant source of energy for natural satellites and an alternative free energy source for sustaining life.

Moons orbiting gas giants or brownish dwarfs are likely to exist tidally locked to their main: that is, their days are as long equally their orbits. While tidal locking may adversely affect planets within habitable zones by interfering with the distribution of stellar radiation, it may work in favour of satellite habitability past allowing tidal heating. Scientists at the NASA Ames Research Center modelled the temperature on tide-locked exoplanets in the habitability zone of ruby-red dwarf stars. They plant that an temper with a carbon dioxide (CO
2 ) pressure of only 1–1.5 standard atmospheres (xv–22 psi) not only allows habitable temperatures, merely allows liquid water on the dark side of the satellite. The temperature range of a moon that is tidally locked to a gas giant could be less farthermost than with a planet locked to a star. Even though no studies have been washed on the subject, modest amounts of CO
2 are speculated to brand the temperature habitable.[18]

Tidal effects could also let a moon to sustain plate tectonics, which would crusade volcanic action to regulate the moon'south temperature[22] [23] and create a geodynamo upshot which would give the satellite a stiff magnetic field.[24]

Axial tilt and climate [edit]

Provided gravitational interaction of a moon with other satellites can be neglected, moons tend to be tidally locked with their planets. In improver to the rotational locking mentioned above, there will also exist a process termed 'tilt erosion', which has originally been coined for the tidal erosion of planetary obliquity confronting a planet's orbit around its host star.[25] The final spin state of a moon and then consists of a rotational menstruum equal to its orbital catamenia effectually the planet and a rotational axis that is perpendicular to the orbital plane.

If the moon's mass is not besides depression compared to the planet, it may in turn stabilize the planet's axial tilt, i.eastward. its obliquity confronting the orbit around the star. On World, the Moon has played an important role in stabilizing the axial tilt of the World, thereby reducing the impact of gravitational perturbations from the other planets and ensuring merely moderate climate variations throughout the planet.[26] On Mars, nonetheless, a planet without significant tidal effects from its relatively low-mass moons Phobos and Deimos, axial tilt tin undergo extreme changes from 13° to twoscore° on timescales of 5 to 10 million years.[27] [28]

Being tidally locked to a giant planet or sub-brown dwarf would let for more moderate climates on a moon than there would be if the moon were a similar-sized planet orbiting in locked rotation in the habitable zone of the star.[29] This is especially true of red dwarf systems, where comparatively high gravitational forces and low luminosities leave the habitable zone in an area where tidal locking would occur. If tidally locked, one rotation about the axis may accept a long time relative to a planet (for example, ignoring the slight axial tilt of Earth's moon and topographical shadowing, whatsoever given betoken on it has two weeks – in World time – of sunshine and two weeks of night in its lunar day) but these long periods of low-cal and darkness are non as challenging for habitability as the eternal days and eternal nights on a planet tidally locked to its star.

In the Solar System [edit]

The following is a list of natural satellites and environments in the Solar System with a possibility of hosting habitable environments:

Name System Article Notes
Europa Jupiter Colonization of Europa Thought to have a subsurface ocean maintained by geologic activity, tidal heating, and irradiation.[xxx] [31] The moon may have more water and oxygen than Earth and an oxygen exosphere.[32]
Enceladus Saturn Enceladus – potential habitability Idea to have a subsurface liquid water ocean due to tidal heating[33] or geothermal activeness.[34] Free molecular hydrogen (H2) has been detected, providing another potential energy source for life.[35]
Titan Saturn Colonization of Titan Its temper is considered like to that of the early Earth, although somewhat thicker. The surface is characterized by hydrocarbon lakes, cryovolcanos, and methyl hydride rain and snow. Similar Globe, Titan is shielded from the solar wind by a magnetosphere, in this example its parent planet for most of its orbit, but the interaction with the moon's atmosphere remains sufficient to facilitate the creation of complex organic molecules. It has a remote possibility of an exotic marsh gas-based biochemistry.[36]
Callisto Jupiter Callisto – potential habitability Thought to have a subsurface ocean heated past tidal forces.[37] [38]
Ganymede Jupiter Ganymede – Subsurface oceans Thought to have a magnetic field, with ice and subterranean oceans stacked up in several layers, with salty water as a second layer on top of the rocky iron cadre.[39] [40]
Io Jupiter Due to its proximity to Jupiter, it is subject to intense tidal heating which makes it the most volcanically active object in the Solar System. The outgassing generates a trace atmosphere.[41]
Triton Neptune Its high orbital inclination with respect to Neptune's equator drives significant tidal heating,[42] which suggests a layer of liquid h2o or a subsurface body of water.[43]
Dione Saturn Data gathered in 2022 suggests an internal water ocean under 100 kilometres of crust possibly suitable for microbial life.[ citation needed ]
Charon Pluto Possible internal ocean of water and ammonia, based on suspected cryovolcanic activeness.[44]

[edit]

Artist's impression of a hypothetical moon around a Saturn-like exoplanet that could exist habitable.

A total of nine exomoon candidates have been detected, but none of them have been confirmed.

Given the general planet-to-satellite(southward) mass ratio of ten,000, Large Saturn or Jupiter sized gas planets in the habitable zone are believed to be the best candidates to harbour Earth-similar moons with more than 120 such planets by 2018.[14] Massive exoplanets known to be located within a habitable zone (such equally Gliese 876 b, 55 Cancri f, Upsilon Andromedae d, 47 Ursae Majoris b, Hard disk 28185 b and HD 37124 c) are of detail interest every bit they may potentially possess natural satellites with liquid water on the surface.

Habitability of extrasolar moons will depend on stellar and planetary illumination on moons besides as the effect of eclipses on their orbit-averaged surface illumination.[45] Across that, tidal heating might play a role for a moon'due south habitability. In 2012, scientists introduced a concept to define the habitable orbits of moons;[45] they define an inner border of an habitable moon around a certain planet and phone call information technology the circumplanetary "habitable edge". Moons closer to their planet than the habitable edge are uninhabitable. When effects of eclipses every bit well as constraints from a satellite'south orbital stability are used to model the delinquent greenhouse limit of hypothetical moons, information technology is estimated that — depending on a moon'due south orbital eccentricity — there is a minimum mass of roughly 0.20 solar masses for stars to host habitable moons within the stellar habitable zone.[17] The magnetic environment of exomoons, which is critically triggered by the intrinsic magnetic field of the host planet, has been identified every bit another factor of exomoon habitability.[46] Most notably, it was found that moons at distances between nigh 5 and xx planetary radii from a behemothic planet could be habitable from an illumination and tidal heating point of view,[46] but still the planetary magnetosphere would critically influence their habitability.[46]

In pop culture [edit]

Natural satellites that host life are common in science fiction. Notable examples in film include: Earth's moon in A Trip to the Moon (1903); Yavin iv from Star Wars (1977); Endor in Render of the Jedi (1983); LV-426 in Alien (1979) and Aliens (1986); Pandora in Avatar (2009);[47] LV-223 in Prometheus (2012); Europa in Europa Study (2013) and Watchmen (TV series) (2019); and, K23 in The Midnight Sky (2020).

In the video game Kerbal Infinite Program and its upcoming sequel, in that location is a habitable satellite named Laythe.

See also [edit]

  • Earth analog
  • Kepler-1625b I, possible exomoon of exoplanet Kepler-1625b

References [edit]

  1. ^ Dyches, Preston; Chou, Felcia (vii April 2015). "The Solar Organisation and Across is Awash in Water". NASA . Retrieved 8 April 2015.
  2. ^ a b Shriber, Michael (26 Oct 2009). "Detecting Life-Friendly Moons". Astrobiology Mag . Retrieved 9 May 2013.
  3. ^ Woo, Marcus (27 January 2015). "Why We're Looking for Alien Life on Moons, Not Merely Planets". Wired . Retrieved 27 January 2015.
  4. ^ Castillo, Julie; Vance, Steve (2008). "Session 13. The Deep Cold Biosphere? Interior Processes of Icy Satellites and Dwarf Planets". Astrobiology. 8 (2): 344–346. Bibcode:2008AsBio...8..344C. doi:ten.1089/ast.2008.1237. ISSN 1531-1074.
  5. ^ Greenberg, Richard (2011). "Exploration and Protection of Europa's Biosphere: Implications of Permeable Ice". Astrobiology. 11 (2): 183–191. Bibcode:2011AsBio..11..183G. doi:ten.1089/ast.2011.0608. ISSN 1531-1074. PMID 21417946.
  6. ^ Parkinson, Christopher D.; Liang, Mao-Chang; Yung, Yuk L.; Kirschivnk, Joseph L. (2008). "Habitability of Enceladus: Planetary Weather for Life". Origins of Life and Evolution of Biospheres. 38 (4): 355–369. Bibcode:2008OLEB...38..355P. doi:10.1007/s11084-008-9135-4. ISSN 0169-6149. PMID 18566911. S2CID 15416810.
  7. ^ Boyd, Robert S. (eight March 2010). "Buried alive: One-half of Earth's life may lie beneath state, ocean". McClatchy DC. Archived from the original on 2014-04-24.
  8. ^ "Phoenix Mars Mission – Habitability and Biological science". Academy of Arizona. 2014-04-24. Archived from the original on 2014-04-24.
  9. ^ Cowen, Ron (2008-06-07). "A Shifty Moon". Scientific discipline News.
  10. ^ Bryner, Jeanna (24 June 2009). "Ocean Hidden Inside Saturn's Moon". Space.com. TechMediaNetwork. Retrieved 22 Apr 2013.
  11. ^ Kipping, David M.; Fossey, Stephen J.; Campanella, Giammarco (2009). "On the detectability of habitable exomoons withKepler-class photometry". Monthly Notices of the Regal Astronomical Club. 400 (1): 398–405. arXiv:0907.3909. Bibcode:2009MNRAS.400..398K. doi:10.1111/j.1365-2966.2009.15472.x. ISSN 0035-8711. S2CID 16106255.
  12. ^ Kaltenegger, L. (2010). "Characterizing Habitable Exomoons". The Astrophysical Journal. 712 (2): L125–L130. arXiv:0912.3484. Bibcode:2010ApJ...712L.125K. doi:10.1088/2041-8205/712/2/L125. ISSN 2041-8205. S2CID 117385339.
  13. ^ "Exomoons Could Be Every bit Likely To Host Life As Exoplanets, Claims Scientists". Cosmos Up. 21 May 2018. Retrieved 27 May 2018.
  14. ^ a b Jorgenson, Amber (five June 2018). "Kepler information reveals 121 gas giants that could harbor habitable moons". Astronomy.
  15. ^ Scharf, Caleb A. (4 Oct 2011). "Exomoons Ever Closer". Scientific American.
  16. ^ Kipping, David (2009). "Transit timing effects due to an exomoon". Monthly Notices of the Regal Astronomical Lodge. 392 (1): 181–189. arXiv:0810.2243. Bibcode:2009MNRAS.392..181K. doi:10.1111/j.1365-2966.2008.13999.x. S2CID 14754293.
  17. ^ a b Heller, R. (2012). "Exomoon habitability constrained by energy flux and orbital stability". Astronomy & Astrophysics. 545: L8. arXiv:1209.0050. Bibcode:2012A&A...545L...8H. doi:ten.1051/0004-6361/201220003. ISSN 0004-6361. S2CID 118458061.
  18. ^ a b c LePage, Andrew J. (August ane, 2006). "Habitable Moons". Sky & Telescope.
  19. ^ Kuiper, Gerard P. (1944). "Titan: A satellite with an temper". The Astrophysical Periodical. 100: 378–383. doi:10.1086/144679.
  20. ^ "In Search Of Habitable Moons". Pennsylvania Country University. Retrieved 2011-07-11 .
  21. ^ Tobie, Gabriel; Lunine, Jonathan I. (2006). "Episodic outgassing as the origin of atmospheric methyl hydride on Titan". Nature. 440 (7080): 61–64. doi:ten.1038/nature04497.
  22. ^ Glatzmaier, Gary A. "How Volcanoes Work – Volcano Climate Effects". Retrieved 29 Feb 2012.
  23. ^ "Solar System Exploration: Io". Solar Organisation Exploration. NASA. Archived from the original on xvi December 2003. Retrieved 29 February 2012.
  24. ^ Nave, R. "Magnetic Field of the Earth". Retrieved 29 February 2012.
  25. ^ Heller, René; Barnes, Rory; Leconte, Jérémy (April 2011). "Tidal obliquity evolution of potentially habitable planets". Astronomy and Astrophysics. 528: A27. arXiv:1101.2156. Bibcode:2011A&A...528A..27H. doi:x.1051/0004-6361/201015809. S2CID 118784209.
  26. ^ Henney, Paul. "How World and the Moon interact". Astronomy Today . Retrieved 25 December 2011.
  27. ^ "Mars 101 – Overview". Mars 101. NASA. Retrieved 25 December 2011.
  28. ^ Armstrong, John C.; Leovy, Conway B.; Quinn, Thomas (October 2004). "A 1 Gyr climate model for Mars: new orbital statistics and the importance of seasonally resolved polar processes". Icarus. 171 (2): 255–271. Bibcode:2004Icar..171..255A. doi:ten.1016/j.icarus.2004.05.007.
  29. ^ Choi, Charles Q. (27 December 2009). "Moons Like Avatar's Pandora Could Be Establish". Space.com . Retrieved 16 January 2012.
  30. ^ Greenberg, R.; Hoppa, G. V.; Tufts, B. R.; Geissler, P.; Riley, J.; Kadel, South. (October 1999). "Anarchy on Europa". Icarus. 141 (2): 263–286. Bibcode:1999Icar..141..263G. doi:10.1006/icar.1999.6187.
  31. ^ Schmidt, B. E.; Blankenship, D. D.; Patterson, G. W. (Nov 2011). "Active formation of 'chaos terrain' over shallow subsurface water on Europa". Nature. 479 (7374): 502–505. Bibcode:2011Natur.479..502S. doi:ten.1038/nature10608. PMID 22089135. S2CID 4405195.
  32. ^ "Moon of Jupiter could support life: Europa has a liquid body of water that lies below several miles of ice". NBC News. 2009-ten-08. Retrieved 2011-07-10 .
  33. ^ Roberts, J. H.; Nimmo, Francis (2008). "Tidal heating and the long-term stability of a subsurface ocean on Enceladus". Icarus. 194 (2): 675–689. Bibcode:2008Icar..194..675R. doi:x.1016/j.icarus.2007.11.010.
  34. ^ Boyle, Alan (March 9, 2006). "Liquid h2o on Saturn moon could support life: Cassini spacecraft sees signs of geysers on icy Enceladus". NBC News . Retrieved 2011-07-10 .
  35. ^ Nield, David (13 April 2017). "NASA: Saturn's Moon Enceladus Has All The Basic Ingredients For Life". sciencealert.com.
  36. ^ "Colonization Of Titan? New Clues to What's Consuming Hydrogen, Acetylene On Saturn's Moon". Scientific discipline Daily. 2010-06-07. Retrieved 2011-07-10 .
  37. ^ Phillips, T. (1998-10-23). "Callisto makes a large splash". Science@NASA. Archived from the original on 2009-12-29.
  38. ^ Lipps, Jere H; Delory, Gregory; Pitman, Joe; et al. (2004). Hoover, Richard B; Levin, Gilbert 5; Rozanov, Alexei Y (eds.). "Astrobiology of Jupiter'due south Icy Moons" (PDF). Proc. SPIE. Instruments, Methods, and Missions for Astrobiology 8. 5555: 10. Bibcode:2004SPIE.5555...78L. doi:x.1117/12.560356. S2CID 140590649. Archived from the original (PDF) on 2008-08-20.
  39. ^ "Ganymede May Harbor 'Lodge Sandwich' of Oceans and Water ice". JPL@NASA. 2014-05-04.
  40. ^ Vance, Steve; et al. (2014). "Astrobiology of Jupiter'due south Icy Moons". Planetary and Space Science. Instruments, Methods, and Missions for Astrobiology VIII. 96: 62. Bibcode:2014P&SS...96...62V. doi:10.1016/j.pss.2014.03.011.
  41. ^ Charles Q. Choi (2010-06-07). "Chance For Life On Io". Science Daily. Retrieved 2011-07-10 .
  42. ^ Nimmo, Francis (15 January 2015). "Powering Triton's contempo geological action past obliquity tides: Implications for Pluto geology". Icarus. 246: ii–10. doi:10.1016/j.icarus.2014.01.044.
  43. ^ Louis Neal Irwin; Dirk Schulze-Makuch (June 2001). "Assessing the Plausibility of Life on Other Worlds". Astrobiology. i (2): 143–sixty. Bibcode:2001AsBio...1..143I. doi:ten.1089/153110701753198918. PMID 12467118.
  44. ^ Cook, Jason C.; Desch, Steven J.; Roush, Ted L.; Trujillo, Chadwick A.; Geballe, T.R. (2007). "Almost-infrared spectroscopy of Charon: Possible show for cryovolcanism on Kuiper Chugalug objects". The Astrophysical Periodical. 663 (2): 1406–1419. doi:10.1086/518222.
  45. ^ a b Heller, René; Rory Barnes (2012). "Exomoon habitability constrained past illumination and tidal heating". Astrobiology. 13 (ane): xviii–46. arXiv:1209.5323. Bibcode:2013AsBio..thirteen...18H. doi:10.1089/ast.2012.0859. PMC3549631. PMID 23305357.
  46. ^ a b c Heller, René (September 2013). "Magnetic shielding of exomoons across the circumplanetary habitable edge". The Astrophysical Journal Letters. 776 (2): L33. arXiv:1309.0811. Bibcode:2013ApJ...776L..33H. doi:10.1088/2041-8205/776/2/L33. S2CID 118695568.
  47. ^ McKie, Robin (thirteen January 2013). "Is there life on moons?". The Guardian . Retrieved fifteen January 2017.

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Source: https://en.wikipedia.org/wiki/Habitability_of_natural_satellites

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