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[Bob-C]

Hi Wisdom and MMStockPlay, IMVHO, eventually we will be able to visit planets around other star systems by bringing them to us rather than zooming to them like in Star Trek. We will employ techniques similar to the proposed technique of mathematical physicist Miguel Alcubierre of bending spacetime by expanding local spacetime behind a space vehicle and locally contracting spacetime in front of the space vehicle thus effectively bringing the desired star and its planets to the spaceship.

According to an article entitled, "Alcubierre drive" from Alcubieere drive

The Alcubierre drive (or Alcubierre metric see: Metric tensor) is a speculative idea based on a valid solution of the Einstein field equations as proposed by Miguel Alcubierre by which a spacecraft might be accelerated to speeds greater than the speed of light in order to achieve the objective of interstellar flight.


History
In 1994 Alcubierre proposed a way of changing the geometry of space by creating a wave which would cause the fabric of space ahead of a spacecraft to contract and the space behind it to expand.[1] The ship would then ride this wave inside a region of flat space known as a warp bubble, and would not move within this bubble, but instead be carried along as the region itself moves as a consequence of the actions of the drive. If this is so, conventional relativistic effects such as time dilation would not apply in the way they would in the case of a ship moving at a very great velocity through flat spacetime, relative to other objects. This method of propulsion would not involve objects in motion at speeds faster than light with respect to the contents of the warp-bubble; that is, a light beam within the warp-bubble would still always move faster than the ship. Thus the mathematical formulation of the Alcubierre metric does not contradict the conventional claim that the laws of relativity do not allow a slower-than-light object to accelerate to faster-than-light speeds. The Alcubierre drive, however, remains a hypothetical concept with seemingly insuperable problems: The amount of energy required is unobtainably large, there is no method to create a warp bubble in a region that does not already contain one, and there is no method to move from the warp-bubble once having arrived at a supposed destination.



The Alcubierre metric defines the warp drive spacetime. This is a Lorentzian manifold which, if interpreted in the context of general relativity, allows a warp bubble to appear in previously flat spacetime and move off at effectively superluminal speed. Inhabitants of the bubble feel no inertial effects. The object(s) within the bubble are not moving (locally) faster than light, instead, the space around them shifts so that the object(s) arrives at its destination faster than light would in normal space.[2]

Best,

Bob