Q&A with Keith Gendreau, principal investigator of the first X-ray space communications experiment (members only)

Nearly a decade after launching from Cape Canaveral on a planet-hunting quest that has netted 2,650 new confirmed worlds beyond our solar system, NASA’s Kepler telescope has paused its observations after on-board sensors detected it is running low on fuel.

Set to fly in its most powerful configuration with five solid rocket boosters, a United Launch Alliance Atlas 5 rocket rolled out to Cape Canaveral’s Complex 41 launch pad Tuesday in preparation for a planned blastoff two days later with a U.S. military communications satellite.

SpaceX’s first Falcon 9 Block 5 rocket, sporting changes to make the booster easier to reuse, rolled out of its hangar and up the ramp to launch pad 39A at NASA’s Kennedy Space Center on Thursday ahead of a planned hold-down engine firing.