Asteroids - Sixty Symbols

Find out why astronomers no longer use symbols for asteroids. More astronomy and physics at http://www.sixtysymbols.com/

 

ScienceCast: Record-Setting Asteroid Flyby

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.