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Sources
kevinforsyth.net
To Reach the High Frontier: A History of U.S. Launch Vehicles
"A valuable contribution to the field of aerospace literature," this book includes an extensive overview of Delta history and development along with chapters on Atlas, Titan, Scout, Space Shuttle, and much more.
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Many other excellent books about spaceflight are recommended here.
27-Mar-98 | Frame dragging evidence
Almost 22 years after it was launched on Delta 123, LAGEOS-1 provided scientists with direct evidence that the Earth pulls spacetime around itself as it rotates, a relativistic effect known as “frame dragging.” 27-Mar-98 NASA Press Release