faster than light travel

The article NASA May Have Accidentally Created a Warp Field is getting people excited about faster than light travel.

You don’t need to travel faster than light to go arbitrarily far in arbitrarily less time. All you need to do is travel closer to the speed of light. As you get closer to c, time dilation and space contraction will contribute to bring arbitrarily distant destinations within reach. Although the travelers will experience relatively manageable passages of time, it is their friends observing from home who will age much more quickly. Travelers moving at nearly c in space have most of their velocity contributing to movement through space dimensions and almost none through time. At home, we are moving at c almost entirely in the time dimension, remaining motionless in space. The laws of physics give everything no option but to move at c through spacetime; we can only choose what part of our motion is through the space dimensions and the remainder is through time.

The benefits imagined from warping space are to alleviate this huge difference in the passage of time, so that travelers can go places and return without generations dying off before they return home. The “faster than light” travel is about how outside observers perceive the traveler’s motion, so that they can share in the experience within their lifetimes. Travelers have no need for FTL motion to reach any destination within their own lifetime, with enough acceleration to move at close to c through space. The desire for FTL motion is for non-travelers who don’t want to die waiting for the travelers to return.

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