Someone - I forget who - made the observation that either: (a) we're alone in the Universe; or (b) we're not; and that (c) either is staggering.https://twitter.com/hrheingold/status/1171920444435288064 …
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Yeah, backwards lightcone is pretty good. In particular we* are in the backwards lightcone of any sentient species in the milky way that is in our backwards lightcone. * for values of "we" that may be preverbal homo sapiens ancestors
This type of clarification is, BTW, one of the things that make Twitter both fun and stimulating. Thanks! (There's some nebulous line between "pedantic correction", which T also brings, & "stimulating clarification". Fun thinking about what puts something in the latter category)
