What's Hot This Week Promising Perseid Meteor Shower Makes Impressive Start By Joe Rao Clear skies over these next few nights and enough personal stamina to stay awake will afford a view of one of the flashiest meteor displays of the year.     Stephen Hawking Says Humanity Won't Survive Without Leaving Earth By Clara Moskowitz If humanity is to survive long-term, it must find a way to get off planet Earth - and fast, according to famed astrophysicist Stephen Hawking.     Sponsored by: Complete Coverage of Expeditions to Earth's Orbit How 'Star Wars' Changed the World Part of Space Station Could Carry Crew to an Asteroid, NASA Says Dazzling Show of Northern Lights Isn't Over Spacewalk Practice for Big Space Station Repair

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