In case you missed it, here’s one for the history books: for the first time ever, I’ve placed a seismometer on the surface of #Mars! Once it’s all set up, I can start listening for marsquakes. More: https://t.co/GYNO4txPPi pic.twitter.com/vUkedVMcTX

— NASA InSight (@NASAInSight) December 20, 2018