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== Films -- Live-Action ==
* In the ''[[Back to The Future]]'' films, time travel needs 1.21 gigawatts -- the only source of which is supposedly [[Deus Ex Nukina|plutonium]] or a [[Lightning Can Do Anything|lightning bolt]]. Large-scale electrical generation power plants can generate several gigawatts or more. Not exactly something you can carry around in a Delorean, but not the impossibility the film makes it out to be.
* ''[[
** That large an object that close to the Earth would be 3,000 - 4,000 times brighter than Ceres, the largest asteroid in the Solar System, and thus easily spotted with the naked eye. It would have naked-eye visibility for a least a few weeks before the 18-day deadline given in the film.
* In ''Star Trek The Motion Picture'' the staggaring, awe-inspiring power of Vger's ball-lightning attack (which is at one point shown disintegrating an entire Klingon fleet) is measured by the Enterprise's sensors and reported by Sulu as being "One to the Twelfth Power". We will leave it as an exercise for the reader to calculate what 1^12 is.
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** The extra matter also ought to turn the River Valley into a miles-deep sewer of human waste in a few short years. There would have to be some means of converting the mass back into energy to avoid this.
* [[Alastair Reynolds]]' ''[[Revelation Space]]'' series is usually very good about keeping distances, masses and velocities in proportion (not too surprising, as Reynolds is an astrophysicist). He does lose track of energy sometimes though. "Redemption Ark" has "crustbuster warheads" with a yield of 1 teraton - that's a million megatons, - and mentions that a destabilized Conjoiner drive on a lighthugger releases three orders of magnitude more energy than THAT. Granted, nobody sane ever tries to harm a lighthugger in vicinity of an inhabited planet, but couple times in the series starships do go up. In "Absolution Gap" lighthugger ''Gnostic Ascension'' blows up when less than 20,000 km from an icy moon Hela. At the very least on hemisphere of Hela should have melted.
* In one of the [[
** In fairness, the author Curtis Saxton is an astrophysicist so he's presumably well-aware of these issues. Most likely, he concluded that the amount of firepower on display is closer to what one would actually expect for a galaxy-spanning civilization capable of traveling many thousands times the speed of the light and creating planet-destroying space stations. That said, it is a bit of an oddity since he's also the author best-known for retconning the canonical size of the Death Star II and ''Executor'' super star destroyer based on what was to him self-evident from the film as shot. Even worse, Saxton is heavily suspected by his critics of being involved in the Pro-Wars side of the online Vs. Debate, and that [[Armed
== Live-Action TV ==
* In ''[[Space: 1999]]'', an explosion at a nuclear waste dump accelerates Earth's moon to a speed that defies the laws of physics. In fact, the energy required to get the moon out of orbit is more than enough to completely pulverize it.
* In the ''[[Star Trek:
** Even better: a Lysian destroyer [[Curb Stomp Battle|effortlessly dispatched by the Enterprise]] earlier in the episode is mentioned as having disruptors worth 2.1 megajoules--500something times stronger than their starbase's shield output. The Satarrans' hat is ''brainwashing entire crews''. Wasn't there a simpler way for them to win the war than to make an episode of television?
* In the Secret of Bigfoot episodes of the ''[[Six Million Dollar Man]]'', Oscar Goldman has to detonate a 500 megaton atomic bomb that's beeh burried 500 feet down to trigger a fault and stop a much bigger earthquake that will level the west coast. The Aliens, who have their base in the vicinity send The Beautiful Woman of the Week to defuse the device, and Steve Austin has to stop her. Steve overcomes the alien and then runs off with T -10 seconds before detonation. It's been established that Steve can run at a top speed of 60 miles an hour, so while I dont know the exact calculations, but 10 seconds of 60 MPH run from an atomic bomb (even 500 feet down) would mean that he gets turned into a slightly lesser grade of Extra Crispy. Although to be fair, writer Kenny Johnson pretty much addresses the problem and goes "Yeah, but what are you going to do?"
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** On the other side of the scale, the Shock Coil weapon somehow manages to kill things with neutrinos. Neutrinos are famous for having almost zero mass. ''Trillions of them are passing through your body right now.'' The description says these neutrinos are "high density" but the sheer amount it would take to do even the smallest bit of damage would be absolutely insane.
* Averted in [[Mass Effect 2]], with the [[Memetic Mutation|Sir Isaac Newton is the deadliest SOB in space sequence]]. The gunnery chief is about right about the energy yield of the ''Everest''-class dreadnought's main gun.
* The fusion or antimatter powerplants for the starships in the ''[[X (
== Western Animation ==
* In ''[[
** Also in the episode "Ben Versus the Negative Ten", the artifact the villains are trying to steal is described by Grandpa Max as containing "The power of a thousand suns... enough to blow a continent off the face of the Earth!" <ref>Which is a true statement, if slightly misleading, as that sort of power could easily blow the face of the Earth off the face of the Earth many, many times over.</ref>
* The [[
** In one ''World's Greatest Superfriends'' episode, a giant Space Viking several times the size of Jupiter steals the Earth, puts it in his belt pouch, and stomps away (!) through interplanetary space. While Apache Chief distracts the villain by growing to his size and wrestling with him (!!), Superman sneaks into his belt pouch, recovers the Earth, and then pushes the Earth back into its proper orbit in the space of a few seconds (!!!). Ignoring the fact that pushing on the Earth that hard would turn it inside-out, this operation would require many times more energy than Superman can possibly store within his own body, even if he were powerered by ''antimatter''.
** In the ''Challenge'' episode "Invasion of the Fearians", Green Lantern is sent out to divert some meteors that are on a collision course with Earth. Unfortunately, the meteors are yellow, so his power ring won't affect them. What does he do? He ''moves the Earth out of the way''.
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