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A comment on A large asteroid recently flew close to Earth. Parent comment

Re:A large asteroid recently flew close to Earth by sxcurry on Monday January 09, 2017 @05:54PM (#13360628)
I've never heard this before. Can you provide a reference for more info?
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Re:A large asteroid recently flew close to Earth by jessriedel on Monday January 09, 2017 @09:53PM (#13362151)
Radar is how lots of asteroid imaging is done:

https://en.wikipedia.org/wiki/Radar_astronomy#Asteroids_and_...

However, I wasn't aware of the optical methods mitchty was referring to.

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