What if there's a bigger, still unknown reference point?

Submitted ⁨⁨8⁩ ⁨months⁩ ago⁩ by ⁨ViscloReader@lemmy.world⁩ to ⁨showerthoughts@lemmy.world⁩

When we think about teleportation, there’s always someone talking about how you should take into account the earth and the sun moving through space. Let’s step back a little (not so much) what if the galaxy we’re currently in is rotating really really fast around another, bigger, still unknown, spacial object?

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spittingimage@lemmy.world ⁨8⁩ ⁨months⁩ ago
You mean like the Great Attractor?

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- ViscloReader@lemmy.world ⁨8⁩ ⁨months⁩ ago
  Oh my god that is so cool, thanks!
  
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- Rognaut@lemmy.world ⁨8⁩ ⁨months⁩ ago
  Appreciate the rabbit hole!
  
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agent_flounder@lemmy.world ⁨8⁩ ⁨months⁩ ago
I mean motion is all relative anyway, right? So would teleportation be like throwing a ball on a train? That is, the ball’s motion depends on the frame of reference. So maybe teleporting would work that way if it were actually possible.

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- CeeBee@lemmy.world ⁨8⁩ ⁨months⁩ ago
  Now what about time travel?
  
  Technically, Marty McFly should have appeared in space far from anything instead of old man Peabody’s Pine farm.
  
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  - intensely_human@lemm.ee ⁨7⁩ ⁨months⁩ ago
    Should have why?
    
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gmtom@lemmy.world ⁨8⁩ ⁨months⁩ ago
Well the thing is the universe is so big that anything further than 14ish billion lightyears away from us basically doesn’t exist. And since the universe rotaing around a point would require a gravitstional onteraction that travels at the speed of light, we physically cannot be rotating around a point further away than that.

And since the same is true for any point in space, there can’t really be any centre to the universe.

The closest we could come to that is a point in the relative centre of the Virgo supercluster, which is the largest structure in “our” universe that are gravitational bound to us and won’t dissappear from our sight as the universe expands.

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- intensely_human@lemm.ee ⁨7⁩ ⁨months⁩ ago
  Yeah but since the speed of light is always relative to a reference frame, wouldn’t the distance to the beginning of the universe depend on the frame you use to measure it?
  
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bjoern_tantau@swg-empire.de ⁨8⁩ ⁨months⁩ ago
Currently the closest thing to a universal reference point we have is the cosmic microwave background. Relative to that we move at about 370 km/s ± 60 km/s, depending on the time of the year and day.

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bigredgiraffe@lemmy.world ⁨8⁩ ⁨months⁩ ago
Hah now this is a great shower thought, if you want some existential dread you should watch this video from Kurzgezagt video about it called You Are Not Where You Think You Are about this idea, it’s great!

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intensely_human@lemm.ee ⁨7⁩ ⁨months⁩ ago
What if reference frames are the average of large mass, and that’s what they mean when they say “space time bending”.

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