The Alcubierre drive (or Alcubierre metric see: Metric tensor) is a speculative idea based on a valid solution of Einstein's field equations as proposed by Miguel Alcubierre, by which a spacecraft may achieve faster-than-light travel, making travel to other stars more feasible. It is impossible for objects to actually accelerate to the speed of light within normal spacetime. However, rather than exceeding the speed of light within its local frame of reference, the ship would traverse distances by contracting space in front of it and expanding space behind it, allowing it to effectively move faster than light. The proposed mechanism implies a negative density of energy and thus requires exotic matter.
Read more about Alcubierre Drive: History, Alcubierre Metric, Mathematics of The Alcubierre Drive, Physics, Difficulties, In Science Fiction
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“I went to the woods because I wished to live deliberately, to front only the essential facts of life, and see if I could not learn what it had to teach, and not, when I came to die, discover that I had not lived.... I wanted to live deep and suck out all the marrow of life, to live so sturdily and Spartan-like as to put to rout all that was not life, to cut a broad swath and shave close, to drive life into a corner, and reduce it to its lowest terms.”
—Henry David Thoreau (1817–1862)