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27 November 2013 12:59 pm ,
Vol. 342 ,
The new head of the National Center for Science Education promises to "fight the good fight" against attacks on...
Analyses of the H7N9 strains isolated from four new cases show that the virus is evolving rapidly, heightening anxiety...
In 2009, Jack Szostak shared a Nobel Prize for his part in discovering the role of telomeres, the end bits of...
Science has exposed a thriving academic black market in China involving shady agencies, corrupt scientists, and...
Paper-selling agencies flourish in the aura of reputable businesses. For some scientists, it may be difficult to tell...
Featuring the first lunar rover in 40 years, Chang'e-3 is seen as an important milestone on China's quest to send a...
Data collected by satellites and floating probes have chronicled a 2-decade rise in the temperature and thickness of a...
Cholesterol, the artery-clogging molecule that contributes to cardiovascular disease, has another nasty trick up its...
- 27 November 2013 12:59 pm , Vol. 342 , #6162
- About Us
Earth-Probing Satellites Still Earthbound
18 August 1998 7:30 pm
It is proving harder for NASA to explore Earth than to send spacecraft millions of kilometers to Jupiter. Launches of two important Earth observation satellites are again on hold due to technical problems, hobbling researchers' efforts to gather data on everything from land-use changes to the carbon cycle and the role of clouds in blocking the sun's radiation.
Landsat 7 and EOS-AM1 were slated for launch earlier this summer, but glitches in both pushed the launch schedule to the end of this year. Now NASA officials say neither will be ready for orbit until next year. During a recent thermal vacuum test, a large batch of key components failed on the $444 million Landsat 7, according to James Irons, the project's deputy scientist.
Meanwhile, problems with the flight operations software for the $1.2 billion EOS-AM1, the first major spacecraft in the Earth Observing System series, likely will set that launch back until next summer, according to agency officials.