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Interstellar travel at the speed of light is way too slow.
Aliens have figured out some other paradigm, which makes linear travel, including all the problems that arise from it, moot.
The laws of physics says otherwise. If an object has mass, then it cannot reach the speed of light or exceed it.
According to Einstein's 1905 paper on Special Relativity:
Δt' = γΔt
where
γ = 1 / √ (1 - (v[SUP]2[/SUP]/c[SUP]2[/SUP]))
The length of moving objects also shrink in the direction in which they move. If you could get to the speed of light (which is not really possible, but imagine if you could) the object's length would shrink to zero. The contracted length of a moving object relative to a stationary one can be calculated by dividing the proper length by the Lorentz factor (γ) – if it were possible for an object to reach the speed of light its length would shrink to zero.
It is theoretically possible to achieve speeds up to 99.99999% the speed of light, but not faster than, or equal to, the speed of light.