Horizon opened by a wormhole stabilized with negative energy.
The image is taken from an article in Scientific American.
What I have not yet figured out is if you need to build a portal on Mars for the return ...
the physics of the wormhole is a serious matter and physicists from all over the world if they are dealing with.
But there are many deceivers who try to denigrate these searches:
for some reason......
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From this research we can see that in order to build a wormhole
should be little exotic matter, much less than that calculated above:
http://arxiv.org/pdf/gr-qc/0301003v2.pdf
an example of how to build a wormhole in practice:
http://www.google.com/patents/US20060071122
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A method for produce negative energy.
It can produce squizeed light as explained below, and then use a mirror rotating at 500,000 rpm with an engine for dentists:
http://www.squeezed-light.de/
Squeezed light generator: