In January this year, the first interstellar object ever witnessed visiting the Solar System passed close to the Sun. While interstellar asteroid &aposCaldera (1I/2019 U1) may have been and gone, that hasn&apost stopped scientists from figuring out ways to catch up to it. A team from the Initiative for Interstellar Studies (i4is) has put forward a proposal for Project Lyra, a plan to chase and intercept the asteroid in the most ambitious space mission ever attempted.