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What are some commonly known facts that are too bizarre for you to believe to be true? (lemm.ee)

submitted 1 year ago by zirzedolta@lemm.ee to c/asklemmy@lemmy.ml

488 comments fedilink hide all child comments

For me it is the fact that our blood contains iron. I earlier used to believe the word stood for some 'organic element' since I couldn't accept we had metal flowing through our supposed carbon-based bodies, till I realized that is where the taste and smell of blood comes from.

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[–] starman2112@sh.itjust.works 11 points 1 year ago (2 children)

Here's something I just ran into looking stuff up for my comment: GN-z11 is one of the farthest galaxies we've ever seen. Thanks to the expansion of the universe, at a distance of over 30 billion light-years, it has to be moving away from us at over twice the speed of light.

What the fuck does that mean, temporally? Like, forget the speed of light, time dilation has to do with space and relative speeds. If I'm moving at near the speed of light relative to you, then my clock will physically tick more slowly. What happens if I'm moving over twice the speed of light? Is the real life GN-z11 in our reference frame moving backwards in time at over twice the rate we're moving forward?

[–] DirtMcGirt@lemmy.world 11 points 1 year ago

From my understanding, this is caused by the universe itself expanding between the 2 objects, not that the object itself is moving that speed relative to us. It's still completely insane to think about, either way.

[–] jon@lemdro.id 4 points 1 year ago (1 children)

I can't find any reference that says it's moving away from us at twice the speed of light, which would violate Relativity. The fact that it is further away from us in light years than the age of the universe in years, is due to the fact that the space itself is expanding.

[–] starman2112@sh.itjust.works 5 points 1 year ago* (last edited 1 year ago) (1 children)

The thing is, it's moving that fast because of the expansion of space. ≈30 billion light-years over ≈14 billion years equates to over twice the speed of light. Does that mean there's no crazy relativistic time dilation, and time is moving normally for them in our frame of reference, since they aren't physically moving, it's space that's expanding? That's just as wild to my brain

[–] jon@lemdro.id 4 points 1 year ago

Relativity only applies to local reference frames and not to the recession rates of cosmologically distant objects.