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SubstantialFrivolity  I'm not even supposed to be here today  2yr ago (text post)   2536 thread views

Friday Fun Thread for October 14, 2022

Be advised; this thread is not for serious in depth discussion of weighty topics (we have a link for that), this thread is not for anything Culture War related. This thread is for Fun. You got jokes? Share 'em. You got silly questions? Ask 'em.

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Oh dang, I just now saw this, in the October Quality Contributions thread! As the interrogator in the initial conversation, thank you for posting this. That's one hell of a follow-up, hah! This kinda stuff interests me quite a bit, but I know very little, so I very much appreciate your patience and thoroughness with this reply! Would you mind horribly if I impose on your grey matter some more? Having read this response, I think my original question was poorly put. It was based on something vaguely remembered from a throwaway conversation somewhen that made sense to me but I didn't fully grok, regarding the interplay of reference frames.

The Hubble constant indicates that the rate of recession increases as distance between the observer and the object in question increases, right? In practice thus far, all observations/measurements are made from Earth (or at least Earth-local) frames, so it seems everything outside our local frame is expanding away from us, with M81 expanding away at 238 km/s from Earth given its current distance of ~12 megaparsecs. So if we travel in that direction at 239 km/s, the rate of expansion between it and us begins to slow down, because we're a bit closer, yah? And that property scales all the way up to lightspeed: as long as we go a little faster than current expansion, we can get there. Which means we have a few thousand years to develop 99.7/c travel without unrecoverably losing much, if any, of the observable universe. (of course those atom lives matter too, but we may simply not be able to save them all)

It's possible I was thinking the Hubble constant was non-linear, which would seem to create some weirdness with multiple observers, but I'm honestly not sure. Either way, thanks again for this comment--I've been reading cosmophysics all day, lol.

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