Huge asteroid headed for close encounter with Earth

By Tatiana A. Dias

Mon, 20 Oct 2025

Florence, a huge near-Earth asteroid, will pass safely by Earth on September 1, 2017, at a distance of about 4.4 million miles (about 18 Earth-Moon distances). It is amongst the biggest near-Earth asteroids ever recorded. To be more precise, measurements from NASA’s Spitzer Space Telescope and NEOWISE mission indicate it is about 2.7 miles in size.


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Tatiana A. Dias

news@challenge.org

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