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[[TropesAreTools But that just doesn't make for a very interesting story.]] If you can see the alien battlefleet when it's six months away, and have six months to prepare an appropriate welcome, a lot of the drama and tension can get sucked out of the story right there. If the Earth-shattering asteroid is spotted before it ever even enters the solar system, there's no need for an ad-hoc plan to send a RagtagBunchOfMisfits up to destroy it, you can make a plan or two, [[CrazyPrepared and three or four contingency plans if those fail.]]

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[[TropesAreTools [[Administrivia/TropesAreTools But that just doesn't make for a very interesting story.]] If you can see the alien battlefleet when it's six months away, and have six months to prepare an appropriate welcome, a lot of the drama and tension can get sucked out of the story right there. If the Earth-shattering asteroid is spotted before it ever even enters the solar system, there's no need for an ad-hoc plan to send a RagtagBunchOfMisfits up to destroy it, you can make a plan or two, [[CrazyPrepared and three or four contingency plans if those fail.]]


Can be a JustifiedTrope, if the object in question has [[HandWave some kind of stealth technology]], or at times on Earth (or other alien worlds) where astronomy was functionally nonexistent. Can also be justified depending on how FasterThanLightTravel works in the setting: if FTL is accurate enough drop a ship or fleet into orbit around their target, and there's no way to detect ships in FTL, then the ship can literally appear over its target with no warning (one of many reasons aspiring Sci-Fi writers are encouraged to think long and hard about the rules of their FTL drives). Can also be TruthInTelevision (see Real Life, below) for objects small enough that they aren't easily visible, but still big enough to cause lots of damage (not necessarily extinction-level damage, but enough to be worrisome).

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Can be a JustifiedTrope, if the object in question has [[HandWave some kind of stealth technology]], or at times on Earth (or other alien worlds) where astronomy was functionally nonexistent. Can also be justified depending on how FasterThanLightTravel works in the setting: if FTL is accurate enough to drop a ship or fleet into an orbit around their target, and there's no way to detect ships in FTL, then the ship can literally appear over its target with no warning (one of many reasons aspiring Sci-Fi writers are encouraged to think long and hard about the rules of their FTL drives). Can also be TruthInTelevision (see Real Life, below) for objects small enough that they aren't easily visible, but still big enough to cause lots of damage (not necessarily extinction-level damage, but enough to be worrisome).


* ''Literature/CaptainFuture and the Space Emperor'' by Creator/EdmondHamilton begins with a DoNotAdjustYourSet moment where a mysterious person warns of a danger; an incoming dark star that will destroy the Solar System unless all its resources are entrusted to him to avert the danger. The star is already close enough to be seen through an amateur's telescope, yet the professional astronomers have noticed nothing, so naturally, after this kind of blunder no one trusts them when they say it's merely a low-mass dust cloud. [[spoiler:Subverted at the end; it's nothing but an enormous hologram, so naturally nothing could be detected until the projectors were turned on.]]

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* ''Literature/CaptainFuture and the Space Emperor'' ''Calling Literature/CaptainFuture'' by Creator/EdmondHamilton begins with a DoNotAdjustYourSet moment where a mysterious person warns of a danger; an incoming dark star that will destroy the Solar System unless all its resources are entrusted to him to avert the danger. The star is already close enough to be seen through an amateur's telescope, yet the professional astronomers have noticed nothing, so naturally, after this kind of blunder no one trusts them when they say it's merely a low-mass dust cloud. [[spoiler:Subverted at the end; it's nothing but an enormous hologram, so naturally nothing could be detected until the projectors were turned on.]]


Can be a JustifiedTrope, if the object in question has [[HandWave some kind of stealth technology]], or at times on Earth (or other alien worlds) where astronomy was functionally nonexistent. Can also be justified depending on how FasterThanLightTravel works in the setting: if FTL is accurate enough drop a ship or fleet into orbit around their target, and there's no way to detect ships in FTL, then the ship can literally appear over its target with no warning (one of many reasons aspiring Sci-Fi writers are encouraged to think long and hard aboutbthe rules of their FTL drives). Can also be TruthInTelevision (see Real Life, below) for objects small enough that they aren't easily visible, but still big enough to cause lots of damage (not necessarily extinction-level damage, but enough to be worrisome).

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Can be a JustifiedTrope, if the object in question has [[HandWave some kind of stealth technology]], or at times on Earth (or other alien worlds) where astronomy was functionally nonexistent. Can also be justified depending on how FasterThanLightTravel works in the setting: if FTL is accurate enough drop a ship or fleet into orbit around their target, and there's no way to detect ships in FTL, then the ship can literally appear over its target with no warning (one of many reasons aspiring Sci-Fi writers are encouraged to think long and hard aboutbthe about the rules of their FTL drives). Can also be TruthInTelevision (see Real Life, below) for objects small enough that they aren't easily visible, but still big enough to cause lots of damage (not necessarily extinction-level damage, but enough to be worrisome).


Can be a JustifiedTrope, if the object in question has [[HandWave some kind of stealth technology]], or at times on Earth (or other alien worlds) where astronomy was functionally nonexistent. Can also be TruthInTelevision (see Real Life, below) for objects small enough that they aren't easily visible, but still big enough to cause lots of damage (not necessarily extinction-level damage, but enough to be worrisome).

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Can be a JustifiedTrope, if the object in question has [[HandWave some kind of stealth technology]], or at times on Earth (or other alien worlds) where astronomy was functionally nonexistent. Can also be justified depending on how FasterThanLightTravel works in the setting: if FTL is accurate enough drop a ship or fleet into orbit around their target, and there's no way to detect ships in FTL, then the ship can literally appear over its target with no warning (one of many reasons aspiring Sci-Fi writers are encouraged to think long and hard aboutbthe rules of their FTL drives). Can also be TruthInTelevision (see Real Life, below) for objects small enough that they aren't easily visible, but still big enough to cause lots of damage (not necessarily extinction-level damage, but enough to be worrisome).

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* Initially played straight then subverted in ''Series/{{Salvation}}''. An MIT student discovers "Samson", an asteroid on a collision course with Earth in 190 days. After his professor disappears, he goes to the tech billionaire Darius Tanz. Being GenreSavvy, Tanz immediately goes to the US government and demands to know more about it. The officials reluctantly admit to have known about the asteroid for awhile but didn't want to cause a panic among the populace, hoping to end the threat before anyone else learns of it.

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* Comet! by Laurence E. Dahners, Hearth-Daster Comet itself is not hidden (it become visible by unassisted eyes shortly after being discovered), NASA instead insists that naming it Earth-Disaster is very bad humor and it will miss Earth by at least 100 000 miles [[spoiler:They lied on direct orders of president to prevent global panic while trying to delivery nuclear devices to correct it's trajectory. Situations becomes much more interesting when trajectory begins changing 'by itself' ]].

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* Probably one of the more realistic versions in the third book of ''Literature/TheEnchantmentEmporium''. There are two objects very close to each other in the sky from their point of view so while they ''do'' notice the first one it's going to be a standard near miss (in cosmic terms) but it kept them from noticing the one behind it on a collision course until it's too late.


-->-- '''''WebVideo/CinemaSins''''', recurring.

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-->-- '''''WebVideo/CinemaSins''''', recurring.
recurring


** After the climactic battle over Antarctica in the seventh season, a season 8 episode dealt with the US Government having to scramble to cover up the fact that some astronomers ''did'' notice the fleet of alien spaceships getting blown up.

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** After the climactic battle over Antarctica in the seventh season, a season 8 episode dealt with the US Government Stargate Program having to scramble to cover up the fact that some astronomers ''did'' notice the fleet of alien spaceships getting blown up.


* [[JustifiedTrope Justified]] in an episode of ''Series/StargateSG1''. An asteroid is coming at Earth, and isn't noticed for quite some time because it's not going through the ecliptic (the plane of space where the planets and the asteroid belt are, and thus where all of Earth's observation equipment is aimed). It was blind luck an amateur astronomer noticed it. [[spoiler:Turns out the asteroid isn't from the Solar System, and probably launched at Earth from that improbable angle deliberately.]]

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* ''Series/StargateSG1'':
**
[[JustifiedTrope Justified]] in an episode of ''Series/StargateSG1''.one episode. An asteroid is coming at Earth, and isn't noticed for quite some time because it's not going through the ecliptic (the plane of space where the planets and the asteroid belt are, and thus where all of Earth's observation equipment is aimed). It was blind luck an amateur astronomer noticed it. [[spoiler:Turns out the asteroid isn't from the Solar System, and probably launched at Earth from that improbable angle deliberately.]]]]
** After the climactic battle over Antarctica in the seventh season, a season 8 episode dealt with the US Government having to scramble to cover up the fact that some astronomers ''did'' notice the fleet of alien spaceships getting blown up.


* ''Captain Future and the Space Emperor'' by Creator/EdmondHamilton begins with a DoNotAdjustYourSet moment where a mysterious person warns of a danger; an incoming dark star that will destroy the Solar System unless all its resources are entrusted to him to avert the danger. The star is already close enough to be seen through an amateur's telescope, yet the professional astronomers have noticed nothing, so naturally, after this kind of blunder no one trusts them when they say it's merely a low-mass dust cloud. [[spoiler:Subverted at the end; it's nothing but an enormous hologram, so naturally nothing could be detected until the projectors were turned on.]]

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* ''Captain Future ''Literature/CaptainFuture and the Space Emperor'' by Creator/EdmondHamilton begins with a DoNotAdjustYourSet moment where a mysterious person warns of a danger; an incoming dark star that will destroy the Solar System unless all its resources are entrusted to him to avert the danger. The star is already close enough to be seen through an amateur's telescope, yet the professional astronomers have noticed nothing, so naturally, after this kind of blunder no one trusts them when they say it's merely a low-mass dust cloud. [[spoiler:Subverted at the end; it's nothing but an enormous hologram, so naturally nothing could be detected until the projectors were turned on.]]

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** Justified in ''Film/IndependenceDayResurgence'', as the ''massive'' (3,000 mile wide!) mothership is shown to have a cloaking device of some kind. Likely the mothership in the previous film had one, as well.


* Averted in ''VideoGame/{{Outpost}}''. The asteroid "Vulcan's Hammer" is detected far away enough that there's time to build an interstellar ship as well as to launch a nuclear weapon for to diverting its path [[spoiler: it fails]].

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* Averted in ''VideoGame/{{Outpost}}''. The asteroid "Vulcan's Hammer" is detected far away enough that there's time to build an interstellar ship as well as to launch a nuclear weapon for to diverting its path path. [[spoiler: it It fails]].


* Averted in ''VideoGame/{{Outpost}}''. The asteroid "Vulcan's Hammer" is detected far away enough that there's time to build an interstellar ship as well as to launch a nuclear weapon for to diverting its path [[spoiler: it fails]].



* As explained in the introduction above just the millions of amateur astronomers worlwide, often with gear a professional observatory would envy, and Internet are the main reasons why the claims of some conspiracy theorists about "NASA hiding that Planet X[[note]]Nope, [[https://en.wikipedia.org/wiki/Planet_Nine Planet IX]] has nothing to see with those claims and is an entirely theoretical object for now[[/note]]/Nibiru/whatever is approaching Earth" cannot be taken seriously. While NASA could have detected said planet when it still was far away and hide that fact, somehow with no leaks, sooner or later amateur astronomers would have spotted that object as it approached and reported its presence[[note]]Not to mention other space agencies as well as professional observatories unrelated to the latter. It's ''very'' hard, after all, to hide the existence of something that could destroy Earth when everyone can spot it if knows where to look[[/note]].

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* As explained in the introduction above just the millions of amateur astronomers worlwide, often with gear a professional observatory would envy, and Internet are the main reasons why the claims of some conspiracy theorists about "NASA hiding that Planet X[[note]]Nope, [[https://en.wikipedia.org/wiki/Planet_Nine Planet IX]] has nothing to see with those claims and is an entirely theoretical object for now[[/note]]/Nibiru/whatever is approaching Earth" cannot be taken seriously. While NASA could have detected said planet when it still was far away and hide that fact, somehow with no leaks, sooner or later amateur astronomers would have spotted that object as it approached and reported its presence[[note]]Not to mention other space agencies as well as professional observatories unrelated to the latter. It's ''very'' hard, ''impossible'', after all, to hide the existence of something that could will destroy Earth when everyone can spot it if knows where to look[[/note]].

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