Comet Made Its Closest Approach To Earth December 16
Although barely visible to the naked eye, Comet 46P/Wirtanen keeps some secrets so close that only radar can uncover them. As the comet was making its close approach to Earth on Dec. 16, it was studied by a team of scientists including Ellen Howell from the UA's Lunar and Planetary Laboratory. The team used Arecibo Observatory's planetary radar, which is supported by NASA's Near-Earth Object Observations program.
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