Showing posts with label Speed of Light. Show all posts
Showing posts with label Speed of Light. Show all posts

Saturday, July 27, 2013

Light Stopped For Minute In Record-Breaking Study



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Light Stopped For Minute In Record-Breaking Study

By Sara Gates
The Huffington Post
7-25-13

    Albert Einstein postulated that nothing is faster than the speed of light. But what if light was stopped dead in its tracks for, say, a minute? Impossible, right? Think again.

Researchers at the University of Darmstadt in Germany achieved an incredible feat when they stopped light for an entire minute inside a crystal.

In a paper about their research, published this month in the journal Physical Review Letters, the scientists explain how they stopped the light using a technique called electromagnetically induced transparency.

The researchers beamed a laser at an opaque crystal, triggering a quantum reaction that turned the crystal transparent. Then they directed a secondary light source at the crystal before cutting power to the laser to render the crystal opaque again.

What happened? The light from the secondary source remained trapped inside the crystal. Through multiple trials, the team was then able to extend the period of time in which the light remained halted within the crystal for up to a minute. . . .

Monday, July 15, 2013

Alien Probes Could Be Surfing the Galaxy


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Alien Probes Could Be Surfing the Galaxy

By Ray Villard
news.discovery.com
7-14-13

      Computer simulations by a pair of researchers at the University of Edinburgh predict that a fleet of interstellar probes could explore the entire Milky Way galaxy within a fraction of the present age of Earth. This may seem like a tall order considering that our farthest interstellar spacecraft, Voyager 1, is still less than a light-day from Earth after being launched 36 years ago.

In the new simulation, however, alien probes only need to travel at 10 percent the speed of light to survey the entire galaxy within 10 million years. And, they could get a turbo-boost and save fuel by doing a slingshot off the gravitational fields of stars.

13 Ways to Hunt Intelligent Aliens

The concept of self-aware and self-replicating probes traveling across the galaxy is nothing new, however; the idea goes as far back as 1960. It was promoted by SETI pioneer Ronald Bracewell as an alternative to listening for interstellar artificial radio signals. The idea of a machine capable of cloning itself goes back at least 100 years; mathematician John von Neumann detailed the operation of such a robot in 1949. . . .