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NASA's Infrared Telescope facility captured asteroid 2012 KT42 as it whizzed by Earth. The telescope locks onto the target (bright object) thus making the stars appear as streaks.

Credit: R. P. Binzel, M. Lockhart (MIT), B. Golisch, S. J. Bus, T. Denault, J. Rayner, A. Tokunaga (NASA IRTF) and A. Gulbis (Southern African Large Telescope)