This second-place Portrait photo shows Jonny Kim in his high-altitude pressure suit. The NASA astronaut wore the suit while inside a WB-57 aircraft, which can fly to altitudes in excess of 60,000 feet (18.3 kilometers).
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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.
