Posts Tagged ‘gravity’

Gravitational Lensing: Astronomers Spot Rare Arc from Hefty Galaxy Cluster

ScienceDaily (June 26, 2012) — Seeing is believing, except when you don’t believe what you see. Astronomers using NASA’s Hubble Space Telescope have found a puzzling arc of light behind an extremely massive cluster of galaxies residing 10 billion light-years away. The galactic grouping, discovered by NASA’s Spitzer Space Telescope, was observed as it existed when the universe was roughly a quarter of its current age of 13.7 billion years. The giant arc is the stretched shape of a more distant galaxy whose light is distorted by the monster cluster’s powerful gravity, an effect called gravitational lensing. The trouble is, the arc shouldn’t exist.

These images, taken by NASA’s Hubble Space Telescope, show an arc of blue light behind an extremely massive cluster of galaxies residing 10 billion light-years away. (Credit: NASA/ESA/University of Florida, Gainsville/University of Missouri-Kansas City/UC Davis)

“When I first saw it, I kept staring at it, thinking it would go away,” said study leader Anthony Gonzalez of the University of Florida in Gainesville, whose team includes researchers from NASA’s Jet Propulsion Laboratory, Pasadena, Calif. “According to a statistical analysis, arcs should be extremely rare at that distance. At that early epoch, the expectation is that there are not enough galaxies behind the cluster bright enough to be seen, even if they were ‘lensed,’ or distorted by the cluster. The other problem is that galaxy clusters become less massive the further back in time you go. So it’s more difficult to find a cluster with enough mass to be a good lens for gravitationally bending the light from a distant galaxy.”

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Electrogravitics – A Simplified Description

Monday, 02 April 2012

‘Electrogravitics. This technology was being developed and tested in all major aerospace companies in the 1950s. Martin, Convair, Lear, Sperry, Raytheon, and many others all were eagerly studying electrogravitics. But in 1959 or early 1960, the technology became highly classified and the path to energy abundance was stymied. Here is a basic description of electrogravitics.’

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