botMB to Hacker News · 1 month agoSurprising Supernova Scars Cover the Earthwww.scientificamerican.comexternal-linkmessage-square0fedilinkarrow-up13arrow-down10file-text
arrow-up13arrow-down1external-linkSurprising Supernova Scars Cover the Earthwww.scientificamerican.combotMB to Hacker News · 1 month agomessage-square0fedilinkfile-text