Charlie Stross on Nostr: nprofile1q…targs how fast is fast? At 3000km/s the interstellar medium is going to ...

nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqzdp33shl69xr0uq3x8n5gsjykq9upycwh6nqm02c3f6x0frrn0dqftargs (nprofile…args) how fast is fast? At 3000km/s the interstellar medium is going to hit like alpha and beta radiation, never mind the neutral hydrogen. That's going to do a number on the planet's upper atmosphere ... At least, untill it hits intergalactic space and the density drops 2-3 orders of magnitude. After which astronomy is going to be stunted—maybe not happening at all until photography is invented. Only planets really visible, no stellar motion.