It isn’t a single “thing” you are some distance away from. It’s photons remaining from the early universe that can be found everywhere without direction. Pick “one” of them and you can track your speed relative to it. It’s the closest thing we have to a universal reference frame.
Also see the later questions on www.astro.ubc.ca/people/scott/faq_basic.html
ulterno@lemmy.kde.social 2 weeks ago
I think they’re trying to say, it can be considered to be a non-accelerated reference frame, where stuff like planets and stars would be accelerated.
Though I have a problem in understanding how it could be taken as a reference frame in the first place.
JackGreenEarth@lemm.ee 2 weeks ago
Indeed, it can’t be a reference frame, as even if it’s not accelerated, it’s everywhere, so it doesn’t have a position or orientation.
ulterno@lemmy.kde.social 2 weeks ago
Not only that, it’s not even a single object. It’s just the name given to a group of radiation, which is ultimately just light going randomly here and there.