This is pure speculation and there may well be other explanations, but two Harvard scientists have speculated that alien lifeforms on distant planets may be travelling through the cosmos using powerful radio beams to power their sails.
See http://www.huffingtonpost.com/entry/aliens-space-travel-fast-radio-bursts_us_58caf1f7e4b00705db4d8f65
Man has been searching for alien life for about 50 years. It is surprising that nothing has been found.
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