'Where is everyone?' It's the famous question about aliens, echoing out to our quiet galactic neighbors after Manhattan Project .But perhaps even a highly advanced extraterrestrial civilization might find itself without the resources or the key information needed to escape their home world, at least according to a new study from 's Atlántico Medio university.Some so-called 'Super Earths' might be within their star's habitable zone, but so massive that their gravity makes interplanetary rocket launches all but impossible.
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