Recent comments in /f/space

Oahkery t1_jb83inn wrote

There's a scientific theory that there's only one electron in the universe, that every one is the same one just looping back and forth in time (the instances of it going backward are all the positrons). It's almost certainly not true (one flaw is that there are a lot more electrons than positrons, for example), but the thought helped lead to idea that particle/antiparticle pairs are the same, just reversed in time.

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blueasian0682 t1_jb7ve9a wrote

For those curious but don't want to read,

First picture: day 0 (3.2 billion light years from earth)

Second picture: 320 days from the first pic.

Third picture: 1000 days from the first pic.

How do they know this? A supernovae clearly seen from the first pic can be seen in the other two images with the same positions but fading away in brightness.

Why are they different timelines? Gravitational lensing that not only bends light but also space time.

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