HEADLINE: Callisto: Europe's Decade-Late Response to SpaceX GUEST: Bob Zimmerman 50-WORD SUMMARY: Callisto, a joint European Space Agency (ESA) and JAXA project proposed in 2015, was meant to be a pro

HEADLINE: Callisto: Europe's Decade-Late Response to SpaceX GUEST: Bob Zimmerman 50-WORD SUMMARY:Callisto, a joint European Space Agency (ESA) and JAXA project proposed in 2015, was meant to be a prototype "grasshopper" to prove vertical takeoff and landing (VTVL), competing with SpaceX. A decade later, little has happened, and the first hop is not expected until 2027. 1960