Q&A with Rolf de Groot, head of ESA’s robotic exploration office

Europe’s Sentinel 2A land imaging satellite designed to glimpse cities, farms and forests from orbit launched aboard a Vega rocket. The 2,500-pound satellite lifted off at 0151:58 GMT Tuesday (9:51:58 p.m. EDT Monday).

Bruce Banerdt leads the InSight science team, and is in charge of the lander heading for Mars to study the red planet’s interior structure, collecting data that should yield new information about the environment in the early solar system, when planets coalesced and formed 4.5 billion years ago.

NASA officials said Thursday the launch of the James Webb Space Telescope will be delayed seven months to Oct. 31, 2021, a schedule slip that takes into account work slowdowns caused by the coronavirus pandemic and the amount of testing required on the observatory before its shipment to French Guiana for liftoff on a European Ariane 5 rocket.