Black Hole Eating a Sandwich

A black hole is a region of spacetime exhibiting gravitational acceleration so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of the region from which no escape is possible is called the event horizon. Although...

Space Shuttle Illustration

The Space Shuttle was a partially reusable low Earth orbital spacecraft system that was operated from 1981 to 2011 by the U. S. National Aeronautics and Space Administration (NASA) as part of the Space Shuttle program. Its official program name was Space Transportation System (STS), taken from a 1969 plan for a system of reusable spacecraft of which it was the only item funded for development....

Paper Mache Planet Mars

Starting around 1725 in Europe, gilded papier-mâché began to appear as a low-cost alternative to similarly treated plaster or carved wood in architecture. Henry Clay of Birmingham, England, patented a process for treating laminated sheets of paper with linseed oil to produce waterproof panels in 1772. These sheets were used for building coach door panels as well as other structural uses....

The Apollo Lunar Roving Vehicle

Managed by Morris Sussman, Cohen's Apollo Theatre had vigorous competition from other venues, such as the Lafayette, managed by Frank Schiffman, which presented acts such as Louis Armstrong, Bill "Bojangles" Robinson and Bessie Smith and Eddie Green. Leo Brecher's Harlem Opera House was another competing venue. To improve the shows at the Apollo, Cohen hired noted talent scout John Hammond to...
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