June 22, 2009
The downside of faster-than-light travel
There's some good news/bad news for space travel advocates and sci-fi fans. First the good news: Faster-than-light travel may be possible!
Now the bad news:
"Star Trek" makes faster-than-light travel look easy, but according to new calculations by Italian physicists, a warp drive could easily create a black hole that would incinerate any passengers on a space craft and then suck Earth into a black hole.
[...]
In normal physics, nothing can move faster than the speed of light. Einstein's theory of relativity forbids it. In normal space any object approaching the speed of light will increase in mass exponentially, and require an exponential increase in the amount of power needed to propel it forward.
There are two exceptions to this rule however. The first is what's commonly called a worm hole, a bridge connecting two different parts of space. A ship crossing this bridge would move at below light speed, but still arrive before a beam of light that would have had to go the long way around.
Warp drives are the second and more appealing option. A ship can't move through space faster than the speed of light. But with enough energy, space itself can move faster than the speed of light.
Known for the Mexican physicist Michael Alcubierre who originally developed the idea in the 1990's, an Alcubierre warp drive would create a bubble of energy behind the ship and a lack of energy in front of the ship, like a giant cosmic wave a space ship could surf. That particular section of space can travel faster than the speed of light in the surrounding space, and anything on or in that bubble will accelerate with it.
[Researchers] propose creating this bubble of space-time by using a massive amount of "exotic matter," or dark energy. (Exactly how this bubble would be created is still a mystery.) According to their calculations and simplified, it would take a huge amount of energy to create the bubble, and then increasing amounts of energy to contain the highly repulsive dark energy.
Eventually the energy would run out. The bubble would rupture, with catastrophic effects. Inside the bubble the temperature would rise to about 10^32 degrees Kelvin, destroying almost anything on the bubble.
Anyone watching the ship nearby wouldn't be much better off.
Surfing the leading edge of a space/time bubble, before being shredded-vaporized?
Cowabunga, dude!
Posted by Mike Lief at June 22, 2009 07:58 AM
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