The big asteroid 2015 TB145, which will cruise within 300,000 miles (480,000 kilometers) of Earth on Halloween (Oct. 31), may actually be a comet, NASA researchers say.
The big asteroid 2015 TB145, which will cruise within 300,000 miles (480,000 kilometers) of Earth on Halloween (Oct. 31), may actually be a comet, NASA researchers say.
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