Why an advanced alien civilisation really COULD wipe us out

Cardiff University's Professor Jane Greaves has identified at least two hypothetical worlds that might exist in our own Milky Way galaxy, hypothetically orbiting stars 70 and 110 light-years away.

She said the two stars, called HD 76932 and HD 201891, were born in our galaxy's turbulent past but could have 'biospheres more advanced' than our own planet.

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