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Technically Mitch (lemmy.world)
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[-] ch00f@lemmy.world 35 points 3 months ago

...Trying to work out if there's a way you could orient a camera, the subject, and the observer such that they could see a picture of when you were older.

[-] surewhynotlem@lemmy.world 48 points 3 months ago

If you figure this out, Einstein appears and kicks you in the nuts.

[-] four@lemmy.zip 14 points 3 months ago

You could just say "here's a picture of me when I was older", and then take the picture and show them. Technically older than you were when you said it

[-] lugal@lemmy.dbzer0.com 4 points 3 months ago

You can take a picture of yourself holding an empty piece of paper and photomontage a later picture into it. You just need a speech bubble and you are good to go

[-] Axolotl_cpp@feddit.it 11 points 3 months ago* (last edited 3 months ago)

Take a twin, put it on a rocket and make the rocket orbit around the earth at the light of speed (with a convenient reason that explain how you did it and why the rocket didn't just disintegrated or other bad stuff) then make him get on earth again and boom! He will see his twin which is a older version of him rn

[-] corvi@piefed.social 9 points 3 months ago

You don’t even need to go near the speed of light. Modern gps satellites already have to account for relativity. It wouldn’t be seeing yourself significantly older, but it’s a measurable distinction.

[-] usrtrv@sh.itjust.works 9 points 3 months ago

Just going to a weekend trip to the mountains can give you a few nanoseconds difference: http://www.leapsecond.com/great2005/tour/

[-] Axolotl_cpp@feddit.it 1 points 3 months ago

Well yeah, but for a very noticeable difference you either gonna need a lot of time or a lot of speed

[-] Klear@quokk.au 4 points 3 months ago

I'm going with a lot of speed. I love drugs!

[-] Klear@quokk.au 3 points 3 months ago

Have the observer look at the subject through a system of mirrors so the light takes longer to reach them than the camera. The extra distance needs to be longer in light-seconds than it takes to create and show them the photo in seconds.

[-] fushuan 1 points 3 months ago* (last edited 3 months ago)

Then the picture is from the last, and the image you see in the mirrors is from a past before the image.

Technically, everything we see is from the past. We can't actually see the present. The further we see, we look further to the past. Things like lightnings we see in the wild happened some fractions of a second before we saw them, for example. Useless trivia but I like it.

[-] Klear@quokk.au 1 points 3 months ago

Yeah sure, but the task was to show someone a picture that is older, not one that is not from the past. That would require some sketchy technobabble at least.

[-] fushuan 1 points 3 months ago

Technically the picture of a twitch streamer is from a more recent past than what they write in the chat since that chat usually has a delay.

Sometimes they even read comments that aren't even in my chat lmao.

[-] lugal@lemmy.dbzer0.com 3 points 3 months ago

There are pictures that show you the exact age you are now. Sometimes they are called "mirrors"

[-] ch00f@lemmy.world 6 points 3 months ago

Nope. Mirrors show you what you looked like when you were 3-4 nanoseconds younger.

[-] lugal@lemmy.dbzer0.com 2 points 3 months ago

Time is relative

this post was submitted on 10 Feb 2026
590 points (100.0% liked)

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