An Astronomer Says He Knows Why Aliens Haven't Contacted Us Yet
Briefly

The destructive power of gamma-ray bursts can eliminate anything in its path, with the ability to sterilize about 10% of the galaxy's planets.
NASA has extensively studied gamma-ray bursts, noticing their occurrence during old stars collapsing into black holes or in energetic regions in new galaxies.
Read at www.popularmechanics.com
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