Live coverage: Vega rocket launches with LISA Pathfinder

After several delays earlier this week, SpaceX conducted a hold-down test-firing of a Falcon 9 rocket at Cape Canaveral Friday evening in a key test before launch next week on a resupply mission to the International Space Station.

Scientists culling through images taken last week by the Rosetta spacecraft’s sharp-eyed science camera have finally pinpointed the exact spot the Philae lander settled on comet 67P/Churyumov-Gerasimenko after a daring descent nearly two years ago, the European Space Agency announced Monday.

The U.S. military’s next GPS navigation satellite was ready for launch from Cape Canaveral at 9:43 p.m. EDT Friday (0143 GMT Saturday) aboard a SpaceX Falcon 9 rocket. But SpaceX aborted the countdown just two seconds prior to liftoff.