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Stephen Hawking: This is the most dangerous time for our planet

"We have the means to destroy our world, but not to escape it"

Stephen Hawking: time on earth is running out

Humanity's best chance for survival is to colonize another planet

Supermoon on November 14

A once-in-a-lifetime phenomenon

NASA discovers “metal rock” on Mars (photos-video)

Called "egg rock" due to its ovoid shape

NASA live streaming: Watch earth from space

Streaming since September 30

NASA Antares rocket explodes after liftoff

The mission was, fortunately, unmanned

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