Extraterrestrial life and interstellar travel are two totally different things. Without some magical warp drive, travel to other stars would be very difficult. The best option we can think of right now is sending robots at like 1% the speed of light (somehow) and hoping they still work when they get there. It may be theoretically someday possible to send frozen embryos on ships with the knowledge of earth (ala Kal-El) and colonize the local galactic cluster that way.
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