History Main / AllPlanetsAreEarthLike

24th Oct '17 3:24:58 PM ScorpiusOB1
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*** Unfortunately, Kepler-22b's mass is still unknown - it could be just below 52.8 Earth masses, making it a "mini-Neptune" and such celestial bodies are not promising abodes for life. We have the same problem with Kepler-62e and f. The estimates range between 36 and 35 Earth masses, not Earth-like in the strictest sense so less than ideal candidates in our search.

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*** Unfortunately, Kepler-22b's mass is still unknown - it could be just below 52.8 Earth masses, making it a "mini-Neptune" and such celestial bodies are not promising abodes for life. We have the same problem with Kepler-62e and f. The estimates range between 36 and 35 Earth masses, not Earth-like in the strictest sense so less than ideal candidates in our search.search[[note]]These are ''upper'' masses, which are considered unrealistic due to the high densities those planets would have. While is generally now assumed that Kepler-22 is a small version of Neptune, perhaps one or even the two worlds of Kepler-62 will be luckier[[/note]].



*** Sadly another subversion. 186f and 438b are being bombarded with extreme ultraviolet (XUV) fluxes, violent stellar flares, and powerful radiation activity from their Red Dwarf parent star every 100 days. Disregarding the tidal locking problems, were you to swap Earth with either of them, and our poor biosphere would be sterilized. 442b is "Super-Earth" which again, we don't know much about. It could be a LethalLavaLand or a mini-Neptune like body.

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*** Sadly another subversion. 186f and 438b are being bombarded with extreme ultraviolet (XUV) fluxes, violent stellar flares, and powerful radiation activity from their Red Dwarf parent star every 100 days. Disregarding the tidal locking problems, were you to swap Earth with either of them, and our poor biosphere would be sterilized. 442b is "Super-Earth" which again, we don't know much about. It could be a LethalLavaLand or a mini-Neptune like body.body, and Proxima Centauri b suffers something similar to 186f and 438b.
13th Oct '17 1:52:21 AM PaulA
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** "[[http://community.fortunecity.ws/tattooine/heinlein/326/CoDominium/haven.htm Haven]]", the titular ''War World'', is pretty much a case of Pournelle getting together with Niven and asking, "[[DeathWorld Exactly how horrible can we make a planet while still letting humans breathe the air?]]"

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** "[[http://community.fortunecity.ws/tattooine/heinlein/326/CoDominium/haven.htm Haven]]", the titular ''War World'', setting of ''Literature/WarWorld'', is pretty much a case of Pournelle getting together with Niven and asking, "[[DeathWorld Exactly how horrible can we make a planet while still letting humans breathe the air?]]"
7th Oct '17 12:07:58 PM Zaptech
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** Most of the planets you can visit in the solar system are relatively Earth-like (in that humans can walk around on them and breathe the atmosphere) but this was due to [[SufficientlyAdvancedAlien the Traveler]] going around and {{terraform}}ing them.Venus, Mars, Io, and Titan, for example, are all inhabitable by humans, while Earth's Moon has at least some atmosphere. That said, each planet retains features from before its conversion. For example, Venus is still a yellow planet with a thick atmosphere and strange weather patterns, but now it can support vast jungles and human cities. Mars remains a red, sandy desert, but it's atmosphere is warm enough, thick enough, and breathable enough for humans. Io, despite being a tiny moon of Saturn, was turned into a verdant green Earth-like world.
** Mercury was ''intended'' to be a very Earth-like world by the Traveler, but [[MechanicalLifeforms the Vex]] came along and [[HostileTerraforming converted the entire planet into a vast Vex machine]]. And while [[https://assets.vg247.com/current//2017/05/destiny_2_environments-6.jpg 7066 Nessus]] ''looks'' Earth-like, only with red vegetation instead of green, the entire planet is another Vex machine world and it has an atmosphere intensely toxic to humans.

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** Most of the planets you can visit in the solar system are relatively Earth-like (in that humans can walk around on them and breathe the atmosphere) but this was due to [[SufficientlyAdvancedAlien the Traveler]] going around and {{terraform}}ing them.Venus, Mars, Io, and Titan, for example, are all inhabitable by humans, while Earth's Moon has at least some atmosphere. That said, each planet retains features from before its conversion. For example, Venus [[http://www.gamersheroes.com/wp-content/uploads/2014/09/Destiny-Hunter.jpg Venus]] is still a yellow planet with a thick atmosphere and strange weather patterns, but now it can support vast jungles and human cities. Mars [[https://www.bungie.net/img/theme/destiny/bgs/pgcrs/patrol_mars.jpg Mars]] remains a red, sandy desert, but it's atmosphere is warm enough, thick enough, and breathable enough for humans. Io, [[http://images.eurogamer.net/2017/metabomb/ioscreenshot3.jpg Io]], despite being a tiny moon of Saturn, moon, was turned into a verdant green Earth-like world.
** Mercury [[http://1.bp.blogspot.com/-qfgcwvpJCDA/VIuTZTy8s6I/AAAAAAAAA9Y/7j4YSqFL2iw/s1600/db_destiny_129.jpg Mercury]] was ''intended'' to be a very Earth-like world by the Traveler, but [[MechanicalLifeforms the Vex]] came along and [[HostileTerraforming converted the entire planet into a vast Vex machine]]. And while [[https://assets.vg247.com/current//2017/05/destiny_2_environments-6.jpg 7066 Nessus]] ''looks'' Earth-like, only with red vegetation instead of green, the entire planet is another Vex machine world and it has an atmosphere intensely toxic to humans.
7th Oct '17 12:04:26 PM Zaptech
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** Most of the planets you can visit in the solar system are relatively earth-like (in that humans can walk around on them and breathe the atmosphere) but this was due to [[SufficientlyAdvancedAlien the Traveler]] going around and {{terraform}}ing them.Venus, Mars, Io, and Titan, for example, are all inhabitable by humans, while Earth's Moon has at least some atmosphere. That said, each planet retains features from before its conversion. For example, Venus is still a yellow planet with a thick atmosphere and strange weather patterns, but now it can support vast jungles and human cities. mars remains a red, sandy desert, but it's atmosphere is warm enough, thick enough, and breathable enough for humans. Io, despite being a tiny moon of Saturn, was turned into a verdant green Earth-like world.
** Mercury was ''intended'' to be a very Earth-like world by the Traveler, but [[MechanicalLifeforms the Vex]] came along and [[HostileTerraforming converted the entire planet into a vast Vex machine]]. And while 7066 Nessus ''looks'' Earth-like, only with red vegetation instead of green, the entire planet is another Vex machine world and it has an atmosphere intensely toxic to humans.

to:

** Most of the planets you can visit in the solar system are relatively earth-like Earth-like (in that humans can walk around on them and breathe the atmosphere) but this was due to [[SufficientlyAdvancedAlien the Traveler]] going around and {{terraform}}ing them.Venus, Mars, Io, and Titan, for example, are all inhabitable by humans, while Earth's Moon has at least some atmosphere. That said, each planet retains features from before its conversion. For example, Venus is still a yellow planet with a thick atmosphere and strange weather patterns, but now it can support vast jungles and human cities. mars Mars remains a red, sandy desert, but it's atmosphere is warm enough, thick enough, and breathable enough for humans. Io, despite being a tiny moon of Saturn, was turned into a verdant green Earth-like world.
** Mercury was ''intended'' to be a very Earth-like world by the Traveler, but [[MechanicalLifeforms the Vex]] came along and [[HostileTerraforming converted the entire planet into a vast Vex machine]]. And while [[https://assets.vg247.com/current//2017/05/destiny_2_environments-6.jpg 7066 Nessus Nessus]] ''looks'' Earth-like, only with red vegetation instead of green, the entire planet is another Vex machine world and it has an atmosphere intensely toxic to humans.
7th Oct '17 12:02:04 PM Zaptech
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* In ''Videogame/{{Destiny}}'':
** Most of the planets you can visit in the solar system are relatively earth-like (in that humans can walk around on them and breathe the atmosphere) but this was due to [[SufficientlyAdvancedAlien the Traveler]] going around and {{terraform}}ing them.Venus, Mars, Io, and Titan, for example, are all inhabitable by humans, while Earth's Moon has at least some atmosphere. That said, each planet retains features from before its conversion. For example, Venus is still a yellow planet with a thick atmosphere and strange weather patterns, but now it can support vast jungles and human cities. mars remains a red, sandy desert, but it's atmosphere is warm enough, thick enough, and breathable enough for humans. Io, despite being a tiny moon of Saturn, was turned into a verdant green Earth-like world.
** Mercury was ''intended'' to be a very Earth-like world by the Traveler, but [[MechanicalLifeforms the Vex]] came along and [[HostileTerraforming converted the entire planet into a vast Vex machine]]. And while 7066 Nessus ''looks'' Earth-like, only with red vegetation instead of green, the entire planet is another Vex machine world and it has an atmosphere intensely toxic to humans.
7th Oct '17 11:47:05 AM Zaptech
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** ''VideoGame/MassEffectAndromeda'' is basically about the main character trying to find an actual Earth-like planet for galactic colonization, after all the scanned "Golden Worlds", supposedly Earth-like planets, turned out to be [[DeathWorld Death Worlds]] with the occasional precursor civilization that has an axe to grind with ''those Milky Way Space Western Nazis'', AKA you.

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** ''VideoGame/MassEffectAndromeda'' is basically about the main character trying to find an actual Earth-like planet for galactic colonization, after all the scanned "Golden Worlds", supposedly Earth-like planets, turned out to be [[DeathWorld Death Worlds]] with the occasional precursor civilization that has an axe to grind with ''those Milky Way Space Western Nazis'', AKA you.Worlds]].
27th Aug '17 9:16:22 AM morenohijazo
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!!Examples

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!!Examples
!!Examples:



* {{Averted|Trope}} in ''VideoGame/NoMansSky''. While there's very few planets that are completely devoid of life, not many planets have ecology that can be described as Earth-like either.

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* {{Averted|Trope}} in ''VideoGame/NoMansSky''. While there's very few Within the planets that are completely devoid of life, not you can explore, many of the planets players will encounter will be lifeless rocks, only 10% of them will have ecology life on them, and only 10% of ''those'' worlds will be flourishing, earthlike "garden"-type worlds. That doesn't necessarily mean that can the non-earthlike worlds (or barely earthlike worlds) will be described as Earth-like either.useless, though: a barren world may have more valuable resources in it than an earthlike world.
26th Aug '17 11:59:58 AM Kotomikun
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* Mostly averted in ''VideoGame/KerbalSpaceProgram''--since it's based on the real solar system, only the third planet from the sun, "Kerbin," is Earth-like. The rest of the planets and moons are lifeless, and many don't even have atmospheres. However, Laythe, one of the gas giant's moons, conveniently has oxygen [[ArtisticLicenseChemistry (which can only exist in a planet's air for long periods if it's constantly replenished by plant life)]] so that jet engines will function.
11th Aug '17 9:31:36 PM lorgskyegon
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* Averted in ''Film/LostInSpace''. It's mentioned that of all the planets found and examined by the space explorers, there is only one which can support human life.


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** Not mentioned in the films, but mentioned in the EU, Kashyyyk and the moon of Endor are said to have quite a bit lower gravity than standard. Hence the incredible size of some of the flora and fauna.
** Given that almost all of the primary characters are human, though, it is likely that it's more of a form of selection bias, i.e. we can survive here so the action takes place here.
22nd Jun '17 2:07:12 AM peterbruells
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* Confirmed and subverted in the ''Literature/PerryRhodan'' series. The Milky Way – rather the whole universe – is full of Earth-like planets, often to be settled by Terran or related colonists. But it's also full of hot and heavy planets suitable for hydrogen-breathers, though oxygens-breathers and hydrogen-breathers rarely interact in day-to-day life.
Also, many of of the earth-like planets have extreme environments, requiring genetic modification from the settlers. Though there are hundreds of heavy-gravity worlds with extreme climates that are being settled „naturally“ by one offshoot of humanity, whose ancestors got mofidicated once.

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* Confirmed and subverted in the ''Literature/PerryRhodan'' series. The Milky Way – rather the whole universe – is full of Earth-like planets, often to be settled by Terran or related colonists. But it's also full of hot and heavy planets suitable for hydrogen-breathers, though oxygens-breathers and hydrogen-breathers rarely interact in day-to-day life. \n Also, many of of the earth-like planets have extreme environments, requiring genetic modification from the settlers. Though there are hundreds of heavy-gravity worlds with extreme climates that are being settled „naturally“ by one offshoot of humanity, whose ancestors got mofidicated once.
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http://tvtropes.org/pmwiki/article_history.php?article=Main.AllPlanetsAreEarthLike