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"AN EXTRAORDINARY "hyperspace" engine that could make interstellar space travel a reality by flying into other dimensions is being investigated by the United States government.
The hypothetical device, which has been outlined in principle but is based on a controversial theory about the fabric of the universe, could potentially allow a spacecraft to travel to Mars in three hours and journey to a star 11 light years away in just 80 days, according to a report in today's New Scientist magazine."
Plausibility: almost certainly impossible
Bonus technology: Hyperspace
If the universe has more spatial dimensions than the three we observe, it may be possible to drive a spacecraft through them, perhaps at extreme speeds. However, this idea depends on the work of an obscure physicist called Burkhard Heim, whose ideas have never passed peer review and are dismissed by most modern physicists as largely incomprehensible.