August 1, 2007 by kb3ljm.

Astrophysicists pondering the subject of time travel have postulated not only whether time travel is theoretically possible but whether it is technically achieveable. The popular concepts using black holes, wormholes, and cosmic strings are not practically possible because they basically require the ability to harness energy equivalent to an exploding star and an inconceivable amount of mass. A more down-to-earth concept has been proposed. Physicist Ronald Mallett is known for his expertise in general relativity, gravitation, black holes, relativistic astrophysics, and quantum cosmology. He has been working with Einstein’s equations for years in an attempt to design a sort of time machine. Professor Mallett has devised an alternative to these time travel methods based on Einstein’s famous relativity equation: E=mc².

http://www.amsat.org/amsat-new/news/

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August 1, 2007 by kb3ljm.

A video on the new Delfi-C3 Amateur Radio satellite, to be launched in a few months, is now available on the web. It will be launched into a 630 km 90 degree sun-synchronous orbit from the Indian launch site at Sriharikota. Currently the launch is expected to take place in September/October this year.

http://www.southgatearc.org/news/july2007/delfi_c3_video.htm

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August 1, 2007 by kb3ljm.

Federal regulators Tuesday approved rules for an upcoming airwave auction that are aimed at giving consumers new choices in cellphones and other devices by breaking the grip of the big wireless carriers. The Federal Communications Commission’s rules also make room for a nationwide network that would fix public-safety agencies’ inability to communicate with each other in a crisis, a critical problem in disasters such as Hurricane Katrina. The rules, approved by a 4-1 vote, set the stage for the January auction of airwaves that will be vacated by TV stations when they start to broadcast in digital only in February 2009. They’re some of the most desirable airwaves ever sold, because they allow signals to travel farther and more easily penetrate buildings.

http://www.usatoday.com/money/industries/telecom/2007-07-31-fcc-airwaves_N.htm

Posted in Wireless, USA Today | Comments Off