This story has been updated at 9:06 a.m. EDT.
Bad weather has forced NASA to delay today's launch of two new lunar probes that are designed to make detailed studies of the inside of the moon and its gravitational field. Windy conditions thwarted two available launch opportunities this morning (Sept. 8), so the agency will have to wait until tomorrow to try again.
NASA's twin Grail spacecraft were scheduled to blast off on an unmanned Delta 2 rocket at 8:37 a.m. EDT (1237 GMT) this morning from the Cape Canaveral Air Force Station in Florida, but upper-level winds in the area caused the agency to stand down.
A second launch opportunity was available at 9:16 a.m. EDT (1316 GMT), but weather conditions did not improve, which forced NASA to hold off until tomorrow (Sept. 9). Still, current predictions do not show significant weather improvements until the weekend. [Photos of NASA's Grail Moon Gravity Mission]
Friday's first launch opportunity opens at 8:33 a.m. EDT (1233 GMT), with a second window available at 9:12 a.m. EDT (1312 GMT).
In addition to the threat of rain and thunderstorms, wind levels are monitored because they affect how rockets fly through Earth's upper atmosphere on their way into orbit. As a result, NASA sets limits on acceptable weather conditions to minimize any potential danger.
NASA has a 42-day window to launch the Grail spacecraft that extends through Oct. 19, agency officials have said.
The $496 million Grail mission will study the lunar interior from crust to core, and will map the moon's gravitational field in unprecedented detail. The three-month expedition is expected to help scientists better understand the composition and evolutionary history of Earth's natural satellite. [Video: Grail's Mission to Map Moon Gravity]
Observations from the twin Grail probes are also expected to shed light on how other large, rocky bodies in the inner solar system formed.
You can follow SPACE.com staff writer Denise Chow on Twitter @denisechow. Follow SPACE.com for the latest in space science and exploration news on Twitter @Spacedotcom and on Facebook.
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