Barnard-Seyfert Astronomical Society

Next BSAS Meeting:

Wednesday, September 17 - 7:30 pm
Cumberland Valley Girl Scout Council Building

BSAS Public Star Party

Saturday, Sep 13 - 8:00 - 10:00 pm
Long Hunter State Park

BSAS Public Star Party

Friday, Sep 26 - 7:30 - 9:00 pm
Bowie Nature Park (Fairview)

August 2014: Droughts, Floods and the Earth's Gravity, by the GRACE of NASA

You might think that the only satellite mission capable of monitoring groundwater around the world would spend its time somehow peering through the surface to measure underground water. But you would be wrong! The mission, named GRACE, is actually two satellites, and what they really do is measure subtle changes in Earth’s gravity field. What can Earth’s gravity field tell us about our changing groundwater reserves? Find out in this month’s column!