ScienceCast: Record-Setting Asteroid Flyby

Описание к видео ScienceCast: Record-Setting Asteroid Flyby

Visit http://science.nasa.gov/ for breaking science news.

On Feb. 15th an asteroid about half the size of a football field will fly past Earth closer than many man-made satellites. Since regular sky surveys began in the 1990s, astronomers have never seen an object so big come so close to our planet.

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