The new discovery indicates that even during the warmest periods since the ice sheet formed, the center of Greenland remained stable. "It’s likely that it did not fully melt at any time," said University of Vermont geologist and lead author Paul Bierman. This allowed a tundra landscape to be locked away, unmodified, under ice through millions of years of global warming and cooling.
Image Credit: Joshua Brown, University of Vermont
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The U.S. Air Force 45th Weather Squadron predicts a 40 percent chance of favorable conditions at launch time. A launch today will send Dragon on a course to rendezvous with the station Sunday morning. The backup launch opportunity for the launch of SpaceX-3 is Saturday, April 19 at 3:02 p.m.
Image Credit: NASA
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The U.S. Air Force 45th Weather Squadron predicts a 40 percent chance of favorable conditions for the launch of SpaceX-3 to the International Space Station today. There is a chance of showers and thunderstorms that could cause violations of the Thick Cloud, Lightning and Flight Through Precipitation rules. For a backup launch opportunity on Saturday the weather is 60 percent “go” with a possibility of violating the Thick Cloud, Liftoff Winds and Flight Through Precipitation rules. For a potential opportunity – if selected – on April 22, there is an 80 percent chance of favorable weather with a possibility of violating the Cumulus Cloud and Thick Cloud rules. The detailed weather forecast is below.
If needed, launch on Saturday would occur at 3:02 p.m. NASA Television coverage would begin at 2 p.m. This would be a three-day trek to the station instead of two days with grapple on Tuesday, April 22. Weather is forecast to improve to 60 percent “go” on Saturday.
Below the weather forecast is a timeline from launch through berthing.
At 9:30 a.m., NASA TV will carry a briefing from Johnson Space Center in Houston to preview a spacewalk that will be conducted by two NASA astronauts aboard the station in the coming week. The spacewalkers will replace a failed backup computer relay system on the space station's truss.
The briefing participants are:
-- Mike Suffredini, International Space Station program manager
-- Brian Smith, International Space Station flight director
-- Glenda Brown, lead spacewalk officer
For the latest information on the SpaceX-3 mission, visit:
For NASA TV streaming video, downlink and scheduling information, visit:
An on-time liftoff this afternoon means the Dragon spacecraft will catch up to the station Sunday, April 20. The Dragon will be grappled at approximately 7:14 a.m. by Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency. He will be assisted in a backup position by NASA Flight Engineer Rick Mastracchio. The Dragon will be attached to the Earth-facing port of the station's Harmony node and will remain in place approximately one month. It is scheduled to return to Earth for a splashdown in the Pacific Ocean off the coast of Baja California May 18.
Live NASA TV coverage of the launch is underway at: http://www.nasa.gov/ntv.
LADEE lacked fuel to maintain a long-term lunar orbit or continue science operations and was intentionally sent into the lunar surface. The spacecraft's orbit naturally decayed following the mission's final low-altitude science phase. More information: http://go.nasa.gov/1nu4xVU
Flight Engineers Steve Swanson (left) and Rick Mastracchio work with spacesuits in the station's Quest airlock.
Image Credit: NASA
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