Q&A with Michel Denis, ExoMars flight director

The European Space Agency’s $1.7 billion robotic Jupiter Icy Moons Explorer mission is ready for liftoff Thursday from French Guiana, beginning an eight-year cruise to the solar system’s largest planet before becoming the first-ever spacecraft to orbit one of Jupiter’s moons in the 2030s.

The James Webb Space Telescope should start returning its first scientific results by the end of 2019, and scientists recently announced a slate of observations selected to whet the appetites of astronomers who will use the multibillion-dollar facility well into the 2020s.

A three-man crew led by six-time space flier Yuri Malenchenko rode a Soyuz rocket into orbit Tuesday, speeding away from a Kazakh launch pad on a six-hour chase of the International Space Station. Docking occurred at 1733 GMT (12:33 p.m. EST).