SpaceX launches NASA mission to track groundwater, ice sheets

A SpaceX Falcon 9 rocket launches NASA's GRACE Follow-on mission that will keep track of groundwater and ice melt.
The NASA/German Research Centre for Geosciences GRACE Follow-On spacecraft launches onboard a SpaceX Falcon 9 rocket, Tuesday, May 22, 2018, from Vandenberg Air Force Base in California. Credit: Bill Ingalls/NASA.

NASA has two new eyes in the sky after SpaceX successfully deployed a pair of sensitive spacecrafts that can detect tiny changes in the Earth's gravitational field.

Why it matters: Known as the GRACE-FO mission, for Gravity Recovery and Climate Experiment Follow-On, the satellites will provide scientists with crucial data for tracking climate change.