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InitialsDiceBearhttps://github.com/dicebear/dicebearhttps://creativecommons.org/publicdomain/zero/1.0/„Initials” (https://github.com/dicebear/dicebear) by „DiceBear”, licensed under „CC0 1.0” (https://creativecommons.org/publicdomain/zero/1.0/)NS
ns1 @ ns1 @feddit.uk
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2 yr. ago

Time travel doesn't work unless you also have teleportation. If you travel to the past/future, Earth will be in a different position in its orbit, and you'll die in space.

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  • This is interesting because the most "realistic" (i.e. still not realistic) depictions of time travel in fiction involve travelling through a singularity or wormhole. So you probably have to be in space to start with, but also both ends of the wormhole have mass so they can be orbiting a planet or star and stay within a stable distance of it. It solves this particular problem (just leaving the other usual problem of causality!) It also proves your point since it does allow travelling in space, in fact it allows travelling faster than light.

    I think the converse is true as well, that if faster than light travel is possible then time travel must be possible, at least if you take relativity at face value. As others have pointed out there's no universal reference frame, and for any journey that is faster than light in one reference frame, there is another frame in which the journey goes backwards in time.

    • Leave the park rule

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  • Don't forget your arms-jumper-umbrella!

    • UK to build 12 nuclear submarines in preparation for potential war with Russia

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  • Thank you, this prompted me to go and look up the meaning of that song. It hadn't occured to me before that it was about the Falklands

    • Permanently Deleted

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    • Star Trek TNG Theme but the theme is coming from the Enterprise-D

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  • Hearing Doppler shift from travelling at warp speed in a vacuum makes for some interesting science!

    • Parentheses

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  • Have to close that one now (first comment doesn't count cos it's in quotes) :)

    • Can anybody anywhere in the world 🌍 create a website like lemmy and Mastodon with possibility of creating multiple instances and feed it into the fediverse so that it gets shared into both lemmy and?

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  • Not sure exactly what the question is but I'm fairly sure the answer is yes. 😀 Anyone can start a Lemmy/Mastodon instance and anyone can create new software that federates with it.

    • Orangutan climbing on a wire at the zoo

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  • The orangutan looks happy. Bet that is fun

    • Dinosaurs are still alive. Today, we call them birds.

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  • My understanding is that this headline has been pretty much accepted as official by biologists for some time now, to the point where "non-avian dinosaurs" has become a common term for the extinct animals. So it's totally correct to say things like "I'm just going to the park to feed the dinosaurs"

    • Morrisons to close 52 cafes and 17 convenience stores

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  • I like cafes and sometimes shop at Morrisons, but I can't say I've ever been to the cafe in Morrisons. This is sad but maybe not surprising

    • I’m new to Lemmy

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  • Welcome! Good to have you here

    • Don't know if this is the right place to ask but is there another well known asklemmy besides asklemmy.ml? Or an AMA place?

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    • Is there a Lemmy equivalent of "r/bestofredditorupdates"?

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    • Centuries-old leasehold system to be abolished in England and Wales

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  • Good to see, but a shame that the plans only apply to new housing developments, and they're being very vague about anything after that. Seems to take an extremely long time to do anything on this issue despite the changes apparently having wide support

    • Hour 12 of a 15-hour trip emigrating to the UK from the U.S. with a teenager. (OC)

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  • Welcome, glad you could join us! And you have a pot of tea already. Hope settling in goes ok when you arrive.

    • How are you dealing with the UK's Online Safety Act, that comes into effect this March?

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    • explosions

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  • Clearly the artist believes in the axiom of choice

    • My blog now has Lemmy comments

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  • Nice work!

    • Personally I prefer NASA's pronunciation, which is "charon".

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  • I always found it funny to read it as Sharon, and now you're telling me it's named after someone called Charlene? This keeps getting better

    • Closure of exponentiation of real algebraic numbers.

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  • You could say something like "the image of exponentiation over...." to mean the set of values created by applying the function once, but it sounds slightly clunky.

    Looks like there aren't really very many sets of mostly transcendental numbers that have names. Computational numbers and periods are two of them, I'd guess that both probably contain your set, so you could compare with those to see where it gets you.