Contrary to the old __1__ (warn) that time waits for no one, time slows down when you are on the move. It also slows down more as you move faster, which means astronauts some day may survive so long in space that they would return to an earth of the _2___ (distance) future.
If you could move at the speed of light, your time would stand still; if you could move faster than light, your time would move backward.
Although no form of matter yet _3___ (discover), moves as fast or faster than light, __4__ (science) experiments has already confirmed that accelerated motion causes a traveler’s time to be _5___ (stretch). Albert Einstein predicted this in 1905, when he introduced the concept of relative times as part of his special theory of __6__ (relative). A search is now under way to confirm the suspected ___7_ (exist) of particles of matter that move at a speed greater than light, and therefore, might serve as our passports to the past. An obsession with time-saving and __8__ (master) it seems to have been a part of humanity for as long as human have existed.
Humanity also has been obsessed with trying to capture the meaning of time. Einstein used a definition of time for experimental purposes, as that which is __9__ (measure) by a clock. Thus time and time’s relativity are __10__ (measure) by any hour glass, alarm clock, or atomic clock that can measure a billionth of a second.
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