As humans continue to search for life in space, some experts speculate the so-called Great Filter theory lies behind why nobody is responding to our call. Civilisations likely destroy themselves ...

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Our galaxy has around 100 to 400 billion stars in it, and there are around the same number of galaxies in the universe. If even a fraction of these stars replicate our sun and have planets with ...

We have not met alien life because intelligent societies tend to wipe themselves out, scientists have claimed - and the human race could be next. A team based at NASA's Jet Propulsion Laboratory has ...