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* '''Returning Precursors''' -- A precursor evolved race/species who once lived on said planet the story revolves around left for the stars for whatever reason and are returning to their ancestral lands with a different branch descended from those precursors being the dominant form of life on it, given their evolution on the planet up to the point they returned was the same prior to departure.
* '''Terraformation/Panspermia''' -- Aliens were the ones who triggered or altered the planet's formation and atmosphere to mirror their home world for their own reasons, allowing life to be fostered, possibly even providing the genetic material as the basic building blocks of all life and waiting for a period of time until the world is vibrant enough to live on.
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Cross-species disease description: Fine-tuning the science a little, and adding an important aspect that was left out


* '''Cross-Species Disease''' -- Humans or aliens affected by alien pathogens or parasites that should not have had time to adapt to a different species' physiology. Even on Earth, most viruses, bacteria, and parasites only affect a single species or a few related ones, and so-called "zoonoses" have generally only been a big deal amongst livestock, which we've intentionally cultivated in close proximity for ages.

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* '''Cross-Species Disease''' -- Humans or aliens affected by alien pathogens Pathogens or parasites that should not have had time to adapt to a different species' physiology. physiology easily infecting other species, and affecting all organisms in the same way. Even on Earth, most viruses, bacteria, and parasites are only affect adapted to survive in certain hosts, sometimes as narrow as a single species. "First Contact" compatibility is extraordinarily rare- when a disease ''can'' infect multiple disparate species, these are usually species or a few related ones, that interact frequently like humans and so-called "zoonoses" have generally only been domestic animals or species that share a big deal amongst livestock, which we've intentionally cultivated in close proximity water source, giving opportunity for ages.evolution to reward versatility. On the other side of the coin, when diseases ''do'' make the jump between species by fluke or mutation, their effects can be radically different in the new host- what causes a mild cold in the original species may be lethal in another (or vice-versa) as the immune system is faced with an OutsideContextProblem and the pathogen [[SpannerInTheWorks flounders]] trying to interact with anatomy and metabolism that doesn't exist in the new host.
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* '''HalfHumanHybrid''' — Humans and aliens are able to produce offspring together; the most blatant offense against conventional biological wisdom. See that entry for examples.
** '''HotSkittyOnWailordAction''' — The same as above, but with the partners being significantly different (e.g. a giant alien being able to reproduce with a human).
* '''NoBiochemicalBarriers/AlienFoodIsEdible''' — Humans and aliens are able to share food and drink. As an extension of this, humans or aliens shown as being able to derive sustenance from utterly alien animal or plant life. ([[ToServeMan Aliens eating humans]] also falls into this category.)
* '''Cross-Species Disease''' — Humans or aliens affected by alien pathogens or parasites that should not have had time to adapt to a different species' physiology. Even on Earth, most viruses, bacteria, and parasites only affect a single species or a few related ones, and so-called "zoonoses" have generally only been a big deal amongst livestock, which we've intentionally cultivated in close proximity for ages.
* '''All Atmospheres Are Equal''' — While species that breathe something other than oxygen are sometimes seen wearing protective gear when moving in oxygen-based atmospheres, species that are capable of breathing an oxygen-rich atmosphere are never shown to be hampered or even affected at all by the other gases (nitrogen, for example[[note]]though nitrogen is unreactive enough that it's commonly used in glove boxes when an inert atmosphere is needed[[/note]]) that constitute the air familiar to humans. Nor do they suffer any problems related to the ''air pressure'' — presumably, AllPlanetsAreEarthlike.

Some of these are more plausible than others, although not by much. While there is reason to believe that Earth's atmosphere carries life because it is particularly suited to life, this is basically a confirmation bias — we consider it suited to life because it is suited to ''our'' life. This position is called the {{anthropic principle}}.

Similarly, some people claim that most lifeforms in the universe would be fundamentally compatible with each other because they would be formed from the same basic chemicals. Science is currently undetermined on who's right - on one hand, carbon's properties mean it's more likely for carbon atoms to combine with other elements and form more complex life forms; on the other hand, with how many other elements exist there are way more chances for those elements to combine over carbon. Regardless even if the aliens we encounter are carbon-based that doesn't mean they'll be compatible: even here on Earth most species cannot reproduce with each other (and even when they can, the offspring are usually sterile) and can't eat the same food (chocolate, as an example, is poisonous to many species).

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* '''HalfHumanHybrid''' -- Humans and aliens are able to produce offspring together; the most blatant offense against conventional biological wisdom. See that entry for examples.
** '''HotSkittyOnWailordAction''' -- The same as above, but with the partners being significantly different (e.g. a giant alien being able to reproduce with a human).
* '''NoBiochemicalBarriers/AlienFoodIsEdible''' -- Humans and aliens are able to share food and drink. As an extension of this, humans or aliens shown as being able to derive sustenance from utterly alien animal or plant life. ([[ToServeMan Aliens eating humans]] also falls into this category.)
* '''Cross-Species Disease''' -- Humans or aliens affected by alien pathogens or parasites that should not have had time to adapt to a different species' physiology. Even on Earth, most viruses, bacteria, and parasites only affect a single species or a few related ones, and so-called "zoonoses" have generally only been a big deal amongst livestock, which we've intentionally cultivated in close proximity for ages.
* '''All Atmospheres Are Equal''' -- While species that breathe something other than oxygen are sometimes seen wearing protective gear when moving in oxygen-based atmospheres, species that are capable of breathing an oxygen-rich atmosphere are never shown to be hampered or even affected at all by the other gases (nitrogen, for example[[note]]though nitrogen is unreactive enough that it's commonly used in glove boxes when an inert atmosphere is needed[[/note]]) that constitute the air familiar to humans. Nor do they suffer any problems related to the ''air pressure'' -- presumably, AllPlanetsAreEarthlike.

Some of these are more plausible than others, although not by much. While there is reason to believe that Earth's atmosphere carries life because it is particularly suited to life, this is basically a confirmation bias -- we consider it suited to life because it is suited to ''our'' life. This position is called the {{anthropic principle}}.

Similarly, some people claim that most lifeforms in the universe would be fundamentally compatible with each other because they would be formed from the same basic chemicals. Science is currently undetermined on who's right - -- on one hand, carbon's properties mean it's more likely for carbon atoms to combine with other elements and form more complex life forms; on the other hand, with how many other elements exist there are way more chances for those elements to combine over carbon. Regardless even if the aliens we encounter are carbon-based that doesn't mean they'll be compatible: even here on Earth most species cannot reproduce with each other (and even when they can, the offspring are usually sterile) and can't eat the same food (chocolate, as an example, is poisonous to many species).



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[[caption-width-right:290:I love the smell of methane in the morning.]]
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[[quoteright:344:[[Webcomic/SandraAndWoo https://static.tvtropes.org/pmwiki/pub/images/fresh_alien_air.png]]]]

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[[quoteright:344:[[Webcomic/SandraAndWoo [[quoteright:290:[[Webcomic/SandraAndWoo https://static.tvtropes.org/pmwiki/pub/images/fresh_alien_air.png]]]]
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Similarly, some people claim that most life-forms in the universe would be fundamentally compatible with each other because they would be formed from the same basic chemicals. Considering that life on other planets wouldn't even necessarily be ''carbon-based'',[[note]]Most likely it would be, though. Its ability to combine with up to four radicals (hydrogen or other carbon-hydrogen-otheratoms molecule with a spare spot) allows the possible molecules to proliferate enormously. The vast majority of corresponding silicon molecules are unstable, except possibly when very cold. And when very cold, silicon and silicon oxides are solid, and can't mix to form the molecules. The proliferating molecules mean that the reproductive chemical would be most likely unrelated to DNA.[[/note]] this is a very naive position. Also, ''arsenic'' is one of those "same basic chemicals" as well. Even here on Earth, most species cannot reproduce with each other (and even when they can, the offspring are usually sterile), not to mention eating different things, etc.[[note]]For example, many foods that humans enjoy are toxic to dogs.[[/note]]

to:

Similarly, some people claim that most life-forms lifeforms in the universe would be fundamentally compatible with each other because they would be formed from the same basic chemicals. Considering that life Science is currently undetermined on other planets wouldn't even necessarily be ''carbon-based'',[[note]]Most who's right - on one hand, carbon's properties mean it's more likely it would be, though. Its ability for carbon atoms to combine with up to four radicals (hydrogen or other carbon-hydrogen-otheratoms molecule elements and form more complex life forms; on the other hand, with a spare spot) allows the possible molecules to proliferate enormously. The vast majority of corresponding silicon molecules how many other elements exist there are unstable, except possibly when very cold. And when very cold, silicon and silicon oxides are solid, and can't mix to form the molecules. The proliferating molecules mean that the reproductive chemical would be most likely unrelated to DNA.[[/note]] this is a very naive position. Also, ''arsenic'' is one of way more chances for those "same basic chemicals" as well. Even elements to combine over carbon. Regardless even if the aliens we encounter are carbon-based that doesn't mean they'll be compatible: even here on Earth, Earth most species cannot reproduce with each other (and even when they can, the offspring are usually sterile), not to mention eating different things, etc.[[note]]For sterile) and can't eat the same food (chocolate, as an example, is poisonous to many foods that humans enjoy are toxic to dogs.[[/note]]
species).
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clarified and expanded


Similarly, some people claim that most life-forms in the universe would be fundamentally compatible with each other because they would be formed from the same basic chemicals. Considering that life on other planets wouldn't even necessarily be ''carbon-based'',[[note]]Most likely it would be, though. Its ability to combine with up to four radicals (hydrogen or other carbon-hydrogen-otheratoms molecule with a spare spot) allows the possible molecules to proliferate enormously. The vast majority of corresponding silicon molecules are unstable, except possibly when very cold. And when very cold, silicon and silicon oxides are solid, and can't mix to form the molecules. The proliferating molecules mean that the reproductive chemical would be most likely unrelated to DNA.[[/note]] this is a very naive position. Also, ''arsenic'' is one of those "same basic chemicals" as well. Even here on Earth, most species cannot reproduce with each other (and then the offspring are usually sterile) not to mention eating different things etc.

to:

Similarly, some people claim that most life-forms in the universe would be fundamentally compatible with each other because they would be formed from the same basic chemicals. Considering that life on other planets wouldn't even necessarily be ''carbon-based'',[[note]]Most likely it would be, though. Its ability to combine with up to four radicals (hydrogen or other carbon-hydrogen-otheratoms molecule with a spare spot) allows the possible molecules to proliferate enormously. The vast majority of corresponding silicon molecules are unstable, except possibly when very cold. And when very cold, silicon and silicon oxides are solid, and can't mix to form the molecules. The proliferating molecules mean that the reproductive chemical would be most likely unrelated to DNA.[[/note]] this is a very naive position. Also, ''arsenic'' is one of those "same basic chemicals" as well. Even here on Earth, most species cannot reproduce with each other (and then even when they can, the offspring are usually sterile) sterile), not to mention eating different things etc.
things, etc.[[note]]For example, many foods that humans enjoy are toxic to dogs.[[/note]]
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Whoops, didn't realize it was namespaced.


* ''AlienFoodIsEdible''' — Humans and aliens are able to share food and drink. As an extension of this, humans or aliens shown as being able to derive sustenance from utterly alien animal or plant life. ([[ToServeMan Aliens eating humans]] also falls into this category.)

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* ''AlienFoodIsEdible''' '''NoBiochemicalBarriers/AlienFoodIsEdible''' — Humans and aliens are able to share food and drink. As an extension of this, humans or aliens shown as being able to derive sustenance from utterly alien animal or plant life. ([[ToServeMan Aliens eating humans]] also falls into this category.)
Is there an issue? Send a MessageReason:
Why name a trope but link to a different one?


* '''[[AlienLunch Alien Food Is Edible]]''' — Humans and aliens are able to share food and drink. As an extension of this, humans or aliens shown as being able to derive sustenance from utterly alien animal or plant life. ([[ToServeMan Aliens eating humans]] also falls into this category.)

to:

* '''[[AlienLunch Alien Food Is Edible]]''' ''AlienFoodIsEdible''' — Humans and aliens are able to share food and drink. As an extension of this, humans or aliens shown as being able to derive sustenance from utterly alien animal or plant life. ([[ToServeMan Aliens eating humans]] also falls into this category.)
Is there an issue? Send a MessageReason:
None


* '''AlienFoodIsEdible''' — Humans and aliens are able to share food and drink. As an extension of this, humans or aliens shown as being able to derive sustenance from utterly alien animal or plant life. ([[ToServeMan Aliens eating humans]] also falls into this category.)

to:

* '''AlienFoodIsEdible''' '''[[AlienLunch Alien Food Is Edible]]''' — Humans and aliens are able to share food and drink. As an extension of this, humans or aliens shown as being able to derive sustenance from utterly alien animal or plant life. ([[ToServeMan Aliens eating humans]] also falls into this category.)
Is there an issue? Send a MessageReason:
None


* '''[[AlienLunch Alien Food]] Is Edible''' — Humans and aliens are able to share food and drink. As an extension of this, humans or aliens shown as being able to derive sustenance from utterly alien animal or plant life. ([[ToServeMan Aliens eating humans]] also falls into this category.)

to:

* '''[[AlienLunch Alien Food]] Is Edible''' '''AlienFoodIsEdible''' — Humans and aliens are able to share food and drink. As an extension of this, humans or aliens shown as being able to derive sustenance from utterly alien animal or plant life. ([[ToServeMan Aliens eating humans]] also falls into this category.)



Some of these are more plausible than others, although not by much. While there is reason to believe that Earth's atmosphere carries life because it is particularly suited to life, this is basically a confirmation bias — we consider it suited to life because it is suited to ''our'' life. This position is called the anthropic principle.

Similarly, some people claim that most life-forms in the universe would be fundamentally compatible with each other because they would be formed from the same basic chemicals. Considering that life on other planets wouldn't even necessarily be ''carbon-based'',[[note]]Most likely it would be, though. Its ability to combine with up to four radicals (hydrogen or other carbon-hydrogen-otheratoms molecule with a spare spot) allows the possible molecules to proliferate enormously. The vast majority of corresponding silicon molecules are unstable, except possibly when very cold. And when very cold, silicon and silicon oxides are solid, and can't mix to form the molecules. The proliferating molecules mean that the reproductive chemical would be most likely unrelated to DNA.[[/note]] this is a very naive position. Also, ''arsenic'' is one of those "same basic chemicals" as well.

to:

Some of these are more plausible than others, although not by much. While there is reason to believe that Earth's atmosphere carries life because it is particularly suited to life, this is basically a confirmation bias — we consider it suited to life because it is suited to ''our'' life. This position is called the anthropic principle.

{{anthropic principle}}.

Similarly, some people claim that most life-forms in the universe would be fundamentally compatible with each other because they would be formed from the same basic chemicals. Considering that life on other planets wouldn't even necessarily be ''carbon-based'',[[note]]Most likely it would be, though. Its ability to combine with up to four radicals (hydrogen or other carbon-hydrogen-otheratoms molecule with a spare spot) allows the possible molecules to proliferate enormously. The vast majority of corresponding silicon molecules are unstable, except possibly when very cold. And when very cold, silicon and silicon oxides are solid, and can't mix to form the molecules. The proliferating molecules mean that the reproductive chemical would be most likely unrelated to DNA.[[/note]] this is a very naive position. Also, ''arsenic'' is one of those "same basic chemicals" as well.
well. Even here on Earth, most species cannot reproduce with each other (and then the offspring are usually sterile) not to mention eating different things etc.
Is there an issue? Send a MessageReason:
None


* '''HalfHumanHybrid''' - Humans and aliens are able to produce offspring together; the most blatant offense against conventional biological wisdom. See that entry for examples.
** '''HotSkittyOnWailordAction''' - The same as above, but with the partners being significantly different (e.g. a giant alien being able to reproduce with a human).
* '''[[AlienLunch Alien Food]] Is Edible''' - Humans and aliens are able to share food and drink. As an extension of this, humans or aliens shown as being able to derive sustenance from utterly alien animal or plant life. ([[ToServeMan Aliens eating humans]] also falls into this category.)
* '''Cross-Species Disease''' - Humans or aliens affected by alien pathogens or parasites that should not have had time to adapt to a different species' physiology. Even on Earth, most viruses, bacteria, and parasites only affect a single species or a few related ones, and so-called "zoonoses" have generally only been a big deal amongst livestock, which we've intentionally cultivated in close proximity for ages.
* '''All Atmospheres Are Equal''' - While species that breathe something other than oxygen are sometimes seen wearing protective gear when moving in oxygen-based atmospheres, species that are capable of breathing an oxygen-rich atmosphere are never shown to be hampered or even affected at all by the other gases (nitrogen, for example[[note]]though nitrogen is unreactive enough that it's commonly used in glove boxes when an inert atmosphere is needed[[/note]]) that constitute the air familiar to humans. Nor do they suffer any problems related to the ''air pressure'' -- presumably, AllPlanetsAreEarthlike.

Some of these are more plausible than others, although not by much. While there is reason to believe that Earth's atmosphere carries life because it is particularly suited to life, this is basically a confirmation bias -- we consider it suited to life because it is suited to ''our'' life. This position is called the anthropic principle.

to:

* '''HalfHumanHybrid''' - Humans and aliens are able to produce offspring together; the most blatant offense against conventional biological wisdom. See that entry for examples.
** '''HotSkittyOnWailordAction''' - The same as above, but with the partners being significantly different (e.g. a giant alien being able to reproduce with a human).
* '''[[AlienLunch Alien Food]] Is Edible''' - Humans and aliens are able to share food and drink. As an extension of this, humans or aliens shown as being able to derive sustenance from utterly alien animal or plant life. ([[ToServeMan Aliens eating humans]] also falls into this category.)
* '''Cross-Species Disease''' - Humans or aliens affected by alien pathogens or parasites that should not have had time to adapt to a different species' physiology. Even on Earth, most viruses, bacteria, and parasites only affect a single species or a few related ones, and so-called "zoonoses" have generally only been a big deal amongst livestock, which we've intentionally cultivated in close proximity for ages.
* '''All Atmospheres Are Equal''' - While species that breathe something other than oxygen are sometimes seen wearing protective gear when moving in oxygen-based atmospheres, species that are capable of breathing an oxygen-rich atmosphere are never shown to be hampered or even affected at all by the other gases (nitrogen, for example[[note]]though nitrogen is unreactive enough that it's commonly used in glove boxes when an inert atmosphere is needed[[/note]]) that constitute the air familiar to humans. Nor do they suffer any problems related to the ''air pressure'' -- presumably, AllPlanetsAreEarthlike.

Some of these are more plausible than others, although not by much. While there is reason to believe that Earth's atmosphere carries life because it is particularly suited to life, this is basically a confirmation bias -- we consider it suited to life because it is suited to ''our'' life. This position is called the anthropic principle.
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Expanded Half-Human Hybrid point and fixed Hot Skitty-on-Wailord Action point; the latter is not specific to Mon series, despite taking its name from Pokemon


* '''HalfHumanHybrid''' - the most blatant offense against conventional biological wisdom. See that entry for examples.
** '''HotSkittyOnWailordAction''' - The same lack-of-mechanism tossed into {{Mon}} series.

to:

* '''HalfHumanHybrid''' - Humans and aliens are able to produce offspring together; the most blatant offense against conventional biological wisdom. See that entry for examples.
** '''HotSkittyOnWailordAction''' - The same lack-of-mechanism tossed into {{Mon}} series.as above, but with the partners being significantly different (e.g. a giant alien being able to reproduce with a human).

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Image suggestion thread suggested "Earlier" be cropped out: https://tvtropes.org/pmwiki/posts.php?discussion=1452266899092104700&page=113


%% Previous image removed per Image Pickin' thread: https://tvtropes.org/pmwiki/posts.php?discussion=1542138610014809900



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%% Image removed per Image Pickin' thread: https://tvtropes.org/pmwiki/posts.php?discussion=1542138610014809900
%% Please start a new thread if you'd like to discuss a new image.

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%% Image removed selected per crowner in Image Pickin' thread: Suggestion Thread: https://tvtropes.org/pmwiki/posts.php?discussion=1542138610014809900
org/pmwiki/crowner.php/ImagePickin/ImageSuggestions90
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Willbyr MOD

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%% Please see thread to discuss a new image.

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%% Please see start a new thread if you'd like to discuss a new image.
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->'''R2''': Obviously the air is highly caustic and poisonous.\\
'''Obi-Wan''': Apparently not.

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->'''R2''': ->'''R2:''' Obviously the air is highly caustic and poisonous.\\
'''Obi-Wan''': '''Obi-Wan:''' Apparently not.

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