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One of the most perfect spheres ever created by humans. A fused quartz gyroscope for the Gravity Probe B experiment which differs from a perfect sphere by no more than a mere 40 atoms of thickness as it refracts the image of Einstein in the background.
This Month in NASA History: 10th Anniversary of the Gravity Probe B Launch

Forty years in the making and no stranger to the threat of cancellation, NASA’s mission to test predictions made by Albert Einstein serves as a testament to a team that was focused, yet flexible.

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The WIRE telescope inside the cryostat assembly.
This Month in NASA History: Learning from WIRE

Fifteen years ago this month, the Wide-field Infrared Explorer’s (WIRE) primary mission came to an abrupt end.

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NASA's Orbiting Carbon Observatory (OCO)-2 spacecraft is moved into a thermal vacuum chamber at Orbital Sciences Corporation's Satellite Manufacturing Facility in Gilbert, Ariz., for a series of environmental tests. The tests confirmed the integrity of the observatory's electrical connections and subjected the OCO-2 instrument and spacecraft to the extreme hot, cold and airless environment they will encounter once in orbit. The observatory's solar array panels were removed prior to the test.
This Month in NASA History: From OCO to OCO–2

February marks the fifth anniversary of the first Orbiting Carbon Observatory (OCO) launch.

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Digital Electronic Engine Control F-15A #287 in flight over California City. Note wing deflection measurement system on right wing. June 18, 1982
This Month in NASA History: Digital Electronic Engine Control System

Ten years ago this month, NASA concluded the Digital Electronic Engine Control research program, which made significant contributions to aircraft engine performance.

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Ice Bridge
This Month in NASA History: Learning from ICESat

Vol. 6, Issue 1 Ten years after an unexpected anomaly, the lessons and knowledge of the ICESat mission live on in current and future missions.

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Advanced Turboprop Project
This Month in NASA History: Advanced Turboprop Project

Vol. 5, Issue 12 Twenty-five years ago, an old technology project earned Lewis Research Center the Collier Trophy.

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Apollo 4's Eight-Hour Mission
This Month in NASA History: Apollo 4’s Eight-Hour Mission

Vol. 5, Issue 11 Forty-five years ago, the unpiloted Apollo 4 spacecraft flew atop a Saturn V rocket to prove NASA could safely reach the moon.

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Launched last month, NASA's Landsat 7 spacecraft now orbits planet Earth. Looking down from an altitude of 700 km, Landsat 7 can map the planet's surface in visible and infrared bands and resolve features 30 meters across or smaller. Credit: NASA
This Month in NASA History: Landsat Turns 40

July 31, 2012 Vol. 5, Issue 7   NASA and the U.S. Geological Survey (USGS) celebrated 40 years of Landsat at the Newseum.

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Comet Hale Bopp seen from Space Shuttle Columbia on STS-83. Credit: NASA
This Month in NASA History: Hale-Bopp, Interrupted

May 30, 2012 — Vol. 5, Issue 5 Fifteen years ago this month, a solar event triggered a rare sight.

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