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It completes one orbit every 122 days and is 1.6 times larger than Earth. This analysis led to the figure of 50 per cent of Sun-like stars having habitable planets. [11] These are at a distance of 1,200, 490 and 1,120 light-years away, respectively. Kornmesser. Life as we know it should be easier to find. an Earth analog) and thus potentially favorable to Earth-like life. Other similarities to Earth come into sharper focus in the search for life. Although there is still a limit as to how small a planet can be and still be habitable, this new study shows that there could still be many more such worlds – smaller than Earth, but habitable, with liquid water – than previously thought. Robin Wordsworth, a co-author on the study, added: Low-mass waterworlds are a fascinating possibility in the search for life, and this paper shows just how different their behavior is likely to be compared to that of Earth-like planets. Why are we here? Most importantly, it needs to be in a habitable zone. This provides a baseline habitability. The new peer-reviewed results were first published in The Astrophysical Journal on August 13, 2019. Planetary habitability is the measure of a planet's or a natural satellite's potential to develop and maintain environments hospitable to life. What makes a planet potentially habitable? This assumes density of material similar to that of the Earth. There are many unanswered questions about our place in the Universe. How small is too small? This might happen even at the inner edge of a star’s habitable zone. Learn more. According to traditional thinking about habitable zones, if a planet is too close to its star, a runaway greenhouse effect might occur, resulting in the planet losing all its water. Basic habitable conditions. A conservative estimate sinks as low as seven per cent, whereas an optimistic valuation can go as high as 75 per cent. A new, full analysis of Kepler data finds at least 300 million Earth-size planets in the habitable zone around Sun-like stars in our galaxy. In this way, the atmospheric expansion might prevent small, low-gravity planets from experiencing a runaway greenhouse effect. [13], This is a list of exoplanets within the habitable zone that are more likely to be rocky. habitable definition: 1. providing conditions that are good enough to live in or on: 2. providing conditions that are…. The habitable zone as traditionally understood. [2], In astronomy and astrobiology, the circumstellar habitable zone (CHZ or sometimes "ecosphere", "liquid-water belt", "HZ", "life zone" or "Goldilocks zone") is the region around a star where a planet with sufficient atmospheric pressure can maintain liquid water on its surface. There Could Be at Least 300 Million Potentially Habitable Worlds in The Milky Way . Learn more. If a planet doesn’t have a favorable climate, it won’t be situated in the “Goldilocks zone.” The correct distance from its sun contains th… Of these planets, 9% (8,700) were successful at least once but, of those, nearly all (about 8,000) were successful fewer than 50 times out of 100 and most (about 4,500) were successful fewer than 10 times out of 100. Environments do not need to contain life to be considered habitable nor are accepted habitable zones the only areas in which life might arise. Yet these red … Image via NASA/JPL-Caltech/SETI Institute/Europa Clipper. Planetary trio – Jupiter, Saturn, Mercury – low in west at dusk. RIP Kepler: NASA ‘retires’ planet-hunting spacecraft . "HADES RV Programme with HARPS-N at TNG: V. A super-Earth on the inner edge of the habitable zone of the nearby M-dwarf GJ 625". But most of these Earth-sized worlds have been detected orbiting red-dwarf stars; Earth-sized planets in wide orbits around Sun-like stars are much harder to detect. Planet Earth has remained habitable for billions of years simply because of good luck, according to a new study. MICHELLE STARR. Our galaxy is filled with potentially habitable planets -- at least 300 million of them, according to NASA. Could there be others like us out there in the galaxy? It’s also interesting to note that these findings, according to the researchers, appear to apply to both G-type sun-like stars as well as M-type red dwarf stars. While each planet in our solar system is unique, the 8 planets can generally be grouped into two different categories: the inner rocky planets (Mercury, Venus, Earth, and Mars) and the outer gas giants (Jupiter, Saturn, Uranus, and Neptune). Specifically, they estimated with that, on average, the nearest habitable zone planet around G and K-type stars is about 6 parsecs away, and there are about 4 rocky planets around G and K-type stars within 10 parsecs (32.6 light years) of the Sun. A new study says that smaller rocky planets could have a better chance of holding on to their water than previously thought. This provides a baseline habitability. Pyle/Getty Images . MICHELLE STARR. S cientists at the University of Southampton have carried out a … But it makes sense, at least at first, to search for something more familiar. Get to know some terrestrial planets Terrestrial TRAPPIST-1 e Terrestrial TRAPPIST-1 e TRAPPIST-1e, the fourth planet from the star, is in the habitable zone, meaning liquid water could exist on its surface. While in school he was known for his passion for space exploration and astronomy. Stephen Dole's Habitable Planets for Man (2nd edition, 1970) estimated the smallest habitable planet would be, In Earth units, mass 0,40, radius 0.78 or 3090 miles, and surface gravity of 0.68. However, it orbits on the hot inner edge of its host star’s habitable zone. [1], Surface planetary habitability is thought to require orbiting at the right distance from the host star for liquid surface water to be present, in addition to various geophysical and geodynamical aspects, atmospheric density, radiation type and intensity, and the host star's plasma environment. Basic habitable conditions. Why are we here? There Could Be at Least 300 Million Potentially Habitable Worlds in The Milky Way . If you don’t mind a bit of jargon, consider it this way. Each planet was simulated 100 times with random climate-altering events occurring each time in order to see if habitable life could be sustained for three billion years like on Earth. A new index, the planet has been found with the help of space telescopes and other high tech monitoring devices. It lies somewhat closer to its star than Venus does to the sun and thus revolves faster than Earth. … sheds light on the important process of atmospheric evolution on small planets. Earth is the only planet in our solar system’s habitable zone. According to research using data from NASA’s Kepler Telescope, around 300 million exoplanets may have water. The scientists … Kepler-186f, the first validated Earth-size planet to orbit a distant star in the habitable zone. Mass is simply the amount of matter a body contains. This new research redefines the lower limit in mass for potentially habitable exoplanets. As astronomer Constantin Arnscheidt, lead author of the paper, explained: When people think about the inner and outer edges of the habitable zone, they tend to only think about it spatially, meaning how close the planet is to the star. Our galaxy is filled with potentially habitable planets -- at least 300 million of them, according to NASA. Pyle . Eddie Gonzales Jr. – MessageToEagle.com – About half the stars similar in temperature to our Sun could have a rocky planet capable of supporting liquid water on its surface, according to new research. And it makes sense that larger rocky planets, like Earth, can maintain their liquid water – and their atmospheres – more easily than very small planets, whose gravity is weaker. HD 85512 b was initially estimated to be potentially habitable,[42][43] but updated models for the boundaries of the habitable zone placed the planet interior to the HZ,[44][45] and it is now considered non-habitable. Two temperate Earth-mass planet candidates around Teegarden's Star", "Earth-Size, Habitable Zone Planet Found Hidden in Early NASA Kepler Data", "Confirmed Planet Overview Page: Kepler-296e", "Confirmed Planet Overview Page: Kepler-62e", "Confirmed Planet Overview Page: K2-18 b", "Hubble Finds Water Vapor on Habitable-Zone Exoplanet for 1st Time", "Confirmed Planet Overview Page: Kepler-61 b", "Confirmed Planet Overview Page: Kepler-22 b", "Confirmed Planet Overview Page: Kepler-296 f", "A potentially habitable planet has been discovered just 11 light-years away". Scientists have discovered that there are at least 24 super-habitable planets that may support life better than the Earth. And "the light's better" in the habitable zone, or the area around a star where planetary surface temperatures could allow the pooling of water. Could there be others like us out there in the galaxy? It holds an average mass of at least 1.3x Earth mass. Both extremes erode the possibility that a planet is habitable, as liquid water is unlikely to persist under such conditions. This assumes density of material similar to that of the Earth. [1], KOI-1686.01 was also considered a potentially habitable exoplanet after its detection in 2011, until proven a false positive by NASA in 2015. Our galaxy holds at least an estimated 300 million of these potentially habitable worlds. Each planet was simulated 100 times with random climate-altering events occurring each time in order to see if habitable life could be sustained for three billion years like on Earth. Stephen Dole's Habitable Planets for Man (2nd edition, 1970) estimated the smallest habitable planet would be, In Earth units, mass 0,40, radius 0.78 or 3090 miles, and surface gravity of 0.68. "Exoplanet catalog-Exoplanet exploration-Kepler-1701b", "Exoplanet catalog-Exoplanet exploration-Kepler-26 e", "Exoplanet-catalog-Exoplanet exploration-Kepler-1606b", "Five Potential Habitable Exoplanets Now", "Kepler Candidate Overview Page: KOI-1686.01", "NASA's Kepler Marks 1,000th Exoplanet Discovery, Uncovers More Small Worlds in Habitable Zones", Habitable Exoplanets Catalogue ranks alien worlds on suitability for life, Definition of "goldilocks" connoting "moderate characteristics" and examples referring to planets dating to 1935, Communication with extraterrestrial intelligence, Gauss's Pythagorean right triangle proposal, Potential cultural impact of extraterrestrial contact, List of interstellar and circumstellar molecules, Exoplanetary Circumstellar Environments and Disk Explorer, List of microorganisms tested in outer space, Search for extraterrestrial intelligence (SETI), Habitability of K-type main-sequence star systems, Enceladus Life Signatures and Habitability, Astrobiology Science and Technology for Exploring Planets, European Astrobiology Network Association, https://en.wikipedia.org/w/index.php?title=List_of_potentially_habitable_exoplanets&oldid=999498624, Short description is different from Wikidata, Wikipedia articles in need of updating from October 2020, All Wikipedia articles in need of updating, Creative Commons Attribution-ShareAlike License, This page was last edited on 10 January 2021, at 14:04. Smaller, cooler red dwarfs are the most common stars in our galaxy, so that in itself would increase the chances of finding more habitable worlds. New findings suggest that rocky planets smaller than Earth might still have liquid water, even if they’re somewhat outside a star’s primary habitable zone. List of nearest terrestrial exoplanet candidates, List of Kepler exoplanet candidates in the habitable zone, Timeline of astronomical maps, catalogs, and surveys, "Far-Off Planets Like the Earth Dot the Galaxy", "Prevalence of Earth-size planets orbiting Sun-like stars", Proceedings of the National Academy of Sciences of the United States of America, "Milky Way may host billions of Earth-size planets", "Our galaxy holds at least 300 million potentially habitable planets, NASA finds", "How many habitable planets are out there? Venus is often mentioned as an example of this process in our own solar system; it might once have had an ocean, but a runaway greenhouse effect occurred, leaving Venus dry as a bone and hot enough on its surface to melt lead. 30 OCTOBER 2020 . With this information, the researchers found that half of the sun-like stars in the Milky Way may be capable of hosting habitable planets. A conservative estimate sinks as low as seven per cent, whereas an optimistic valuation can go as high as 75 per cent. However, the question of what makes a planet habitable is much more … Image via Harvard SEAS/Astrobiology Magazine. In conditions of a warming atmosphere, on a low-mass world with relatively weak gravity the exoplanet’s atmosphere expands outward, becoming larger and larger relative to the size of the planet. ESI: 0.78Discovered in 2012, this unconfirmed exoplanet candidate is one of the most potentially habitable planets being about four times as massive as Earth, making it a “Super Earth”. Please update this article to reflect recent events or newly available information. habitable Bedeutung, Definition habitable: 1. providing conditions that are good enough to live in or on: 2. providing conditions that are…. After poring over data from a nine-year mission, NASA says there are at least 300 million potentially habitable planets in the Milky Way. But now, scientists from Harvard University have found that even very small rocky exoplanets, orbiting other stars, might still hold onto their water, boosting their chances for habitability. Get to know some terrestrial planets Terrestrial TRAPPIST-1 e Terrestrial TRAPPIST-1 e TRAPPIST-1e, the fourth planet from the star, is in the habitable zone, meaning liquid water could exist on its surface. Of these planets, 9% (8,700) were successful at least once but, of those, nearly all (about 8,000) were successful fewer than 50 times out of 100 and most (about 4,500) were successful fewer than 10 times out of 100. Milky Way holds at least 300 MILLION habitable planets with liquid water on their surfaces - and the closest are just 20 light-years away, NASA claims Based on what we’ve observed in our own solar system, large, gaseous worlds like Jupiter seem far less likely to offer habitable conditions. (CNN) — Our galaxy is filled with potentially habitable planets -- at least 300 million of them, according to NASA. [1], Kepler-69c has gone through a similar process; though initially estimated to be potentially habitable,[46] it was quickly realized that the planet is more likely to be similar to Venus,[47] and is thus no longer considered habitable. An illustration representing the legacy of NASA's Kepler space telescope. Where can we expect to find life beyond Earth? The US space agency's Kepler Space Telescope spent nine years on a planet-hunting mission, successfully identifying thousands of exoplanets in our galaxy before running out of fuel in 2018. life. [49], List from the Habitable Exoplanets Catalog, Conservative sample of potentially habitable exoplanets, Optimistic sample of potentially habitable exoplanets. This finding expands on the traditional view of a star’s habitable zone, the zone around a star where temperatures are just right, allowing liquid water to exist. This exoplanet which is believed to be a water world lies just about 1,200 light years away from us in the constellation Lyra making it one of the most potentially habitable planets. So does Mars count as a “habitable planet”? Many rocky planets have been detected in Earth’s size-range: a point in favor of possible life. Of these, Kepler-186f is closest in size to Earth, with 1.2 times Earth's radius, and it is located towards the outer edge of the habitable zone around its red dwarf host star. Most importantly, it needs to be in a habitable zone. Any planets less massive than that would lose their atmospheres to space before liquid water could form on their surfaces, and any water that might be present would vaporize or freeze. Besides, the new scale builds on previous selection techniques, primarily based on weather. [12], In September 2020, astronomers identified 24 potential superhabitable planets (planets better than Earth), including unconfirmed planets, from among more than 4000 confirmed exoplanets at present, based on astrophysical parameters, as well as the natural history of known life forms on the Earth. The alien world is a so-called "super Earth" that's at least 4.5 times as massive as our planet, and it completes an orbit every 28 days. LHS 1140b is located in the liquid water habitable zone surrounding its host star, a small, faint red star named LHS 1140. (CNN) -- Our galaxy is filled with potentially habitable planets -- at least 300 million of them, according to NASA. Note that this does not ensure habitability, and that * represents an unconfirmed planet or planet candidate. Our galaxy holds at least an estimated 300 million of these potentially habitable worlds. RIP Kepler: NASA ‘retires’ planet-hunting spacecraft . Further, Proxima Centauri b orbits the star about 0.05 AU at a distance of nearly 11.2 Earth days. The potentially habitable planet TOI 700 d is only 100 light years away. This is a list of exoplanets within the habitable zone that are less likely to be rocky, and are more likely to be mini-Neptunes. (CNN) — Our galaxy is filled with potentially habitable planets — at least 300 million of them, according to NASA. Each planet was simulated 100 times with random climate-altering events occurring each time in order to see if habitable life could be sustained for three billion years like on Earth. The HEC is maintained by the Planetary Habitability Laboratory at the University of Puerto Rico at Arecibo. However, the question of what makes a planet habitable is much more complex than having a planet located at the right distance from its host star so that water can be liquid on its surface: various geophysical and geodynamical aspects, the radiation, and the host star's plasma environment can influence the evolution of planets and life, if it originated. This bodes well in the search for life beyond our solar system. NASA Identifies 300 Million Potentially Habitable Planets With at least four exoplanets within 30 light-years of the Earth’s sun. To start off, if we intend to inhabit an artificially built planet, we would need to find a good spot for it in space. The fact is the larger K and G stars normally only have 1 or 2 planets in the habitual zone. In 2015, the blog was renamed as Planetaria. They make great gifts. Life may be generated directly on a planet or satellite endogenously or be transferred to it from another body, through a hypothetical process known as panspermia. With this information, the researchers found that half of the sun-like stars in the Milky Way may be capable of hosting habitable planets. The researchers also used their findings to figure out a question regarding certain moons in our solar system. After poring over data from a nine-year mission, NASA says there are at least 300 million potentially habitable planets in the Milky Way. This analysis led to the figure of 50 per cent of Sun-like stars having habitable planets. This has the effect of increasing both the absorption and radiation of heat from the star, allowing the planet to achieve a kind of balance, maintaining a stable temperature. The list is based on estimates of habitability by the Habitable Exoplanets Catalog (HEC), and data from the NASA Exoplanet Archive. Artist’s concept of one of the rocky worlds orbiting the TRAPPIST-1 red dwarf star, with possible liquid water on the surface. Note that this does not ensure habitability, and that * represents an unconfirmed planet or planet candidate. [8][9][10], A 2015 review concluded that the exoplanets Kepler-62f, Kepler-186f and Kepler-442b were likely the best candidates for being potentially habitable. No, it does not – at least not for the purpose of this discussion as we can’t just land and walk around there. Up till now, we have believed that Earth is the only habitable planet in the Universe, but a new survey says there might be a lot more! However, the question of what makes a planet habitable is much more complex than having a planet located at the right distance from its host star so that water can be liquid on its surface: various geophysical and geodynamical aspects, the radiation, and the host star's plasma environment can influence the evolution of planets and life, if it originated. A lot of what makes a planet habitable falls into a few categories: its size, its distance from its host star, and exactly what kind of star it orbits around. In other words, their work suggests that – for small exoplanets that are not too small – something interesting occurs as one of these planets, even if it is on the edge of its star’s habitable zone, begins to warm due to the greenhouse effect. Ever since astronomers confirmed the presence of planets outside of our solar system, also known as exoplanets, humanity has wondered how many of these planets might have. The results of a new study have been published, and the researchers found exoplanet data suggests there could be at least 300 million potentially habitable planets in the Milky Way. The researchers wondered if these kinds of small icy moons could be habitable on the surface if they were closer to the sun, but the new study suggests they would be too small. Scientists have discovered that there are at least 24 super-habitable planets that may support life better than the Earth. There are many unanswered questions about our place in the Universe. A new study has redefined the lower limit in mass for habitable exoworlds. [7] In a 2020 journal-accepted preprint scientists published estimates of the occurrence rates of rocky habitable zone planets around Sun-like stars with updated data and criteria related to stellar effective temperature for habitable zones – including ∼4 such exoplanets around G and K dwarf stars within 10 pc of the Sun, ~300 million in the Milky Way and an average distance of the nearest HZ planet around G and K dwarfs about 6 pc. [2], In November 2013, astronomers reported, based on Kepler space mission data, that there could be as many as 40 billion Earth-sized planets orbiting in the habitable zones of Sun-like stars and red dwarfs in the Milky Way,[5][6] 11 billion of which may be orbiting Sun-like stars. This is a list of potentially habitable exoplanets. Earth is included for comparison.[14]. Earth is the only planet in our solar system’s habitable zone. The critical boundary point seems to be about 2.7 percent of the mass of Earth. Source: Atmospheric Evolution on Low-gravity Waterworlds. This new definition extends what we can think of as a habitable zone for small, low-mass and (because gravity depends on mass) low-gravity exoplanets. Order now. Once observations for this class of objects become possible, it’s going to be exciting to try to test these predictions directly. habitable definition: 1. providing conditions that are good enough to live in or on: 2. providing conditions that are…. Instead, they might be able to maintain their surface liquid water, even on the inner edge of the habitable zone, in relatively close proximity to their stars. [3][4], A potentially habitable planet implies a terrestrial planet within the circumstellar habitable zone and with conditions roughly comparable to those of Earth (i.e. The answer, though, seems to be no, as they are too small. For example, Mercury (0.0553 Earth mass) only has about half the mass of Mars (0.107 Earth mass), but its surface gravity is nearly the same (0.38 … For comparison, the moon is 1.2 percent of Earth’s mass and Mercury is 5.53 percent. The exoplanet, Kepler-1649c, circles a red dwarf star that lies 300 light-years from Earth, a new study reports. [1], Kepler-438b was also initially considered potentially habitable, with highest ESI of 0.88; however, it was later found to be a subject of powerful flares that can strip a planet of its atmosphere, so it is now considered non-habitable. 30 OCTOBER 2020 . Image via NASA/Astronomy Now. Larger terrestrial exoplanets (those at least twice as massive as Earth) are classified as super-Earths. Both extremes erode the possibility that a planet is habitable, as liquid water is unlikely to persist under such conditions. By Sophie Caraan. Paul Scott Anderson has had a passion for space exploration that began when he was a child when he watched Carl Sagan’s Cosmos. ", "The Occurrence of Rocky Habitable Zone Planets Around Solar-Like Stars from Kepler Data", "A Review of the Best Habitable Planet Candidates", "NASA Discovers Potentially Habitable Earth-Sized World in Star's 'Goldilocks' Zone", "In Search for a Planet Better than Earth: Top Contenders for a Superhabitable World", Creative Commons Attribution 4.0 International License, "A terrestrial planet candidate in a temperate orbit around Proxima Centauri", Monthly Notices of the Royal Astronomical Society, "Confirmed Planet Overview Page: Kepler-452 b", "Confirmed Planet Overview Page: Kepler-62f", "Welcome to LHS 1140b: A Super-Earth in the Habitable Zone", "The CARMENES search for exoplanets around M dwarfs. He has also written for Universe Today and SpaceFlight Insider, and has also been published in The Mars Quarterly and has done supplementary writing for the well-known iOS app Exoplanet for iPhone and iPad. Credit: NASA Ames/JPL-Caltech/T. The US space agency's Kepler Space Telescope spent nine years on a planet-hunting mission, successfully identifying thousands of exoplanets in our galaxy before running out of fuel in 2018. Nasa/Jpl-Caltech/T. While each planet in our solar system is unique, the 8 planets can generally be grouped into two different categories: the inner rocky planets (Mercury, Venus, Earth, and Mars) and the outer gas giants (Jupiter, Saturn, Uranus, and Neptune). Life as we know it requires liquid water, among other factors. Going fast! The results of a new study have been published, and the researchers found exoplanet data suggests there could be at least 300 million potentially habitable planets in the Milky Way. It lies just 11.905 light years from Earth and is the fourth planet of the system in distance to its star, the Tau Ceti. The habitability has not been developed but is unlikely to be habitable because the planet suffers 2,000 times the wind pressure of the Earth from the solar wind. A team of researchers led … What is the likelihood of our existence? With this information, the researchers found that half of the sun-like stars in the Milky Way may be capable of hosting habitable planets. Image via ESO/M. What is the likelihood of our existence? The exoplanet, Kepler-1649c, circles a red dwarf star that lies 300 light-years from Earth, a new study reports. To start off, if we intend to inhabit an artificially built planet, we would need to find a good spot for it in space. Larger terrestrial exoplanets (those at least twice as massive as Earth) are classified as super-Earths. But actually, there are many other variables to habitability, including [a planet’s] mass. Graphic depicting the new lower size limit for smaller rocky exoplanets. Each planet was simulated 100 times with random climate-altering events occurring each time in order to see if habitable life could be sustained for three billion years like on Earth. While interested in all aspects of space exploration, his primary passion is planetary science. Get to know some terrestrial planets. "The major message from our simulations is that there's a decent chance that the planet would be habitable," said Anthony Del Genio, a planetary … Kepler-62 e is a Super-Earth exoplanet that orbits in the inner habitable zone of its star, Kepler-62 (which is slightly smaller and cooler than our sun). Very small planets – at least larger than only 2.7% of the mass of Earth – could maintain liquid water (depending on other factors), according to this new work, while planets smaller than that limit would have their water escape to space or freeze. Take a close look at the Trappist 1 system and you will see the most common place to find life in the universe. The US space agency's Kepler Space Telescope spent nine years on a planet-hunting mission, successfully identifying thousands of exoplanets in our galaxy before running out of fuel in 2018. Get to know some terrestrial planets. (CNN) — Our galaxy is filled with potentially habitable planets -- at least 300 million of them, according to NASA. It suggests that low-mass waterworlds might exist and might be a place to look. EarthSky 2020 lunar calendars are available! [1], Similarly, Tau Ceti f was initially considered potentially habitable,[48] but the improved model of the circumstellar habitable zone places the planet exterior to the outer limits of habitability, so it is now considered non-habitable. He started his blog The Meridiani Journal in 2005, which was a chronicle of planetary exploration. Setting a lower bound for habitability in terms of planet size gives us an important constraint in our ongoing hunt for habitable exoplanets and exomoons. With 400-600 billion stars in the Milky Way Galaxy, about half of which are single, about 20% of which are main-sequence stars with temperatures between 4800 and 6300 K (what this preprint defines as Sun-like), about half of which having Earth-size planets (with 0.5-1.5 Earth masses) in their habitable zone (the essential result of this preprint), shouldn’t that figure of 300 million be 20-30 billion (since 400-600 … Scientists had wondered if Jupiter’s icy moons Europa, Ganymede and Callisto could become habitable on the surface if they were closer to the sun, especially since they all have subsurface oceans beneath their ice crusts. In 2011, he started writing about space on a freelance basis, and now currently writes for AmericaSpace and Futurism (part of Vocal). The planet weighs about 6.6 times the mass of Earth and is shown … Moreover, the recently discovered planet Kepler-442b is about 1,100 light-years away from the earth. Jupiter’s icy ocean moon Europa as seen by Galileo in the late 1990s. At least four of these exoplanets may be within 30 light-years of the sun, with the closest one located no more than 20 light-years away. Bottom line: A new study has found that small exoplanets have a better chance of holding on to their water than previously thought, increasing the chances that some of them could be habitable.

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