Q&A with Scott Bolton, principal investigator on NASA’s Juno mission

A United Launch Atlas 5 rocket is set to launch the U.S. Air Force’s fourth Advanced Extremely High Frequency communications satellite from Cape Canaveral. This timeline shows the major mission events planned over a three-and-a-half-hour flight to an optimized geostationary transfer orbit.

Scientists using the Hubble Space Telescope have found the best evidence yet of a salty ocean of liquid water lurking beneath the surface of Jupiter’s largest moon Ganymede, ripening the icy world’s allure as mission planners design probes for more detailed exploration.

The 100th flight by United Launch Alliance took off Friday for deployment of a sophisticated geomobile communications satellite to bridge the digital divide in Mexico while extending the rocket company’s unparalleled record of success in launching $80 billion in space assets.