NASA photographer Jim Ross earned a third place People prize for this wild shot of an unnamed NASA pilot riding alongside an F-15 Eagle N897NA.
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The space balls could have been part of a rocket that recently reentered through the atmosphere.
New measurements could force astronomers to revise the mass of the galaxy.
The spacecraft rendezvoused in orbit for a simulated orbital threat scenario.
Whatever it is, it's nothing registered in our chemical database, researchers say.
The probe will conduct a detailed scientific survey of the asteroid and send a sample back to Earth for further analysis.
Photo: NASA/Jim Ross 
