By eldercactus, r*ddit link

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[–] 100 points 4 months ago (45 children)

Why do people say that Superman doesn't go back in time by spinning the earth backwards? He goes back in time and the earth appears to spin backwards because it is in reverse time.

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  • [–] 53 points 4 months ago (18 children)

    It’s no dumber than Star Trek saying that slingshotting yourself around the sun is a tried and tested method of time travel.

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  • [–] 40 points 4 months ago* (last edited 4 months ago) (6 children)

    TBF they discovered it dring that episode, and only ever did it once again. Also it wasn't just any star, and they slingshot into a warp speed most ships can't achieve.

    But ya magnets + gravity + speed /= backwards time travel lol

    edit: Canonically James T Kirk wrote about time travel. The first chapter begins as follows.

    Dont.

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  • [–] 12 points 4 months ago (2 children)

    Canonically James T Kirk wrote about time travel. The first chapter begins as follows.

    Dont.

    The second chapter was.

    Do.

    And the final chapter on time travel was.

    It.

    he really like suspenseful pauses.

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  • [–] 3 points 4 months ago* (1 child)

    With our current mathematical models of physics, if you travel faster than light, you go backwards in time. Though, most scientific communities reject the possibility of FTL travel. However, there’s still the idea of tachyons, I guess.

    A pretty good source on the topic: https://youtube.com/playlist?list=PLsPUh22kYmNC0xsEp6YXRq2ALms7fTwrx

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  • [–] 7 points 4 months ago (1 child)

    Well I mean Kirk did it that one time with his Vulcan zombie buddy, so obviously it's been known for at least a century by that point

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  • [–] 5 points 4 months ago

    He wasn't a zombie - he was a mind-ghost that first haunted an elderly human being and then when it became more convenient switched to possess the body of an unwitting minutes-old child cellular clone. None of these btw were first asked if they would consent!

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  • [–] 5 points 4 months ago (4 children)

    tbf the gravity of a sun is on a scale that puts it into black hole territory. I suppose by slingshotting around a star you could increase your gravitational state enough for time to "speed up" or "slow down".

    this was actually observed in the Hafele–Keating experiment.

    though, it should be noted, we have observed time travel in three states:

    • normal flow
    • slow flow
    • faster flow

    but we have never observed an ability to roll back the passage of time. though it may be possible, it would most certainly require an exotic material (like red matter) to trigger such a perverse violation of time.

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  • [–] 2 points 4 months ago (1 child)

    Or the avengers explanation for time travel.

    Oh, when you are small, time runs slower? Wow, then we can definitely travel back in time like that, because... Quantum!

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  • [–] 21 points 4 months ago (4 children)

    Yeah, I've never understood why people don't get this. The scene has him flying around the planet so that we can see within a single frame what he is doing and what effect it is producing. Granted, it is completely made up physics he is using, but it isn't as stupid or unreasonable as people portray it as.

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  • [–] 14 points 4 months ago (1 child)

    Then Donner shouldn't have had Superman flying around the earth in the same direction that the rotation changed to. Like if Superman had been flying around the world North-South, it wouldn't look like he was physically turning the rotation of the planet back with his flying.

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  • [–] 5 points 4 months ago* (1 child)

    Wow, do I feel stupid. Thank you.

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  • [–] 3 points 4 months ago*

    Thing is, in the movie he then reverses course to get the world spinning the right way again. He changes the rotation twice. I feel like the "visual representation of time travel" explanation is from people who haven't watched the whole movie, just the clip.

    Maybe he overshot and went too far into the past and had to catch up, with raises the question why he didn't stop everything bad in the movie by punching Lex Luthor right at the start...

    This video shows the whole sequence, he un-reverses the Earth's spin at ~1:38.

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  • [–] 3 points 4 months ago* (last edited 4 months ago) (12 children)

    so i have a hard time to decode your comment, maybe it is because i am not deeply familiar with superman, but this comic is not about time travel.

    earth's rotational speed on equator is roughly 1600 km/h (or ~1000 mph in freedom units). anything else on earth, including people, is also rotating with the same speed. we just don't have the feel for that speed because nothing in our inertial system is moving, the only thing we can see moving are celestial objects, as we rotate around them.

    if it would really be possible to instantly switch the direction on rotation, anything that is not bolted to earth would steel have its momentum and continue moving in the speed and direction given by it.

    so anything, including people, would continue flying ~1600 kmh, and since the earth is now rotating the other direction, it would factually result in the speed of ~3200 kmh relative to surface of earth, killing anything alive almost instantly (as soon they hit any object connected to ground.

    object incapable of withstanding this momentum switch, like i assume all houses, would instantly collapse.

    this all would be accompanied by winds at the speed of ~3200 kmh, unless superman's magic trick can somehow reverse rotation of the atmosphere together with earth.

    this is what you see in the last panel. long story short, the fucking moron would instantly destroy earth.

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  • [–] 19 points 4 months ago (2 children)

    The comic references the way Superman seems to rewind time at the end of the 1978 Christopher Reeve movie. In the the film, Superman flies fairly high above the earth, accelerating faster and faster until he travels back in time. The way this is depicted shows the earth's rotation slowing down, and eventually rotating backwards. A common misconception of the movie is that he is making the earth rotate backwards - he is not, he is just himself accelerating to faster than light speeds high above the atmosphere.

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  • [–] 46 points 4 months ago (12 children)

    ...wait hear me out on this one: slow the rotation down by just a bit, so that a day lasts an equivalent of ~30 hours instead of 24.

    Work a full shift. Fuck around with whatever your hobbies are after work until you've had your fill and are actually tired enough to sleep. Still get a full 8 hours.

    I mean, it'd be great for like 2 weeks, until our corporate overlords decide to stretch an '8 hour' shift to fit the difference, but hey, that's what guillotines are for.

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  • [–] 17 points 4 months ago

    Watch that 8 hour workday quickly get moved first to 10 hours (capitalist argument being that it’s the new 1/3rd of the β€œday”), before ultimately consuming all additional 6 hours and having you work 14 hours straight like some feudal peasant serf.

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  • [–] 15 points 4 months ago (6 children)

    Down boy! There's a time and a place, and some of us just want to read some comics, as the world burns all around us, ya'know?

    img

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  • [–] 12 points 4 months ago (3 children)

    That doge comic reminds me so much of the class struggle outlined in Das Kapital.

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  • [–] 3 points 4 months ago (1 child)

    I think it'd be great for like 2 days. After that your circadian rhythm is sufficiently fucked that you're somewhat unlikely to still be enjoying yourself.

    Maybe after a month or two we've mostly adapted and are sleeping 10-12 hours. That still leaves us with a cool 2-4 extra hours, not too shabby.

    Alternative proposal: simply change the working day to 6 hours.

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  • [–] 16 points 4 months ago (1 child)

    Imagine having just ripped ass before he turned back time and you un-fart.

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  • [–] 4 points 4 months ago (2 children)

    Ha, the second and fifth panel are identical apart from Superman being in the fifth.

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