The Sky Tonight

March 09, 2015

Dawn: We Have Arrived at Ceres
Pasadena CA (JPL) Mar 09, 2015
Since its discovery in 1801, Ceres has been known as a planet, then as an asteroid, and later as a dwarf planet. Now, after a journey of 3.1 billion miles (4.9 billion kilometers) and 7.5 years, Dawn calls it "home." Earth's robotic emissary arrived at about 4:39 a.m. PST today. It will remain in residence at the alien world for the rest of its operational life, and long, long after. Before we delve into this unprecedented milestone in the exploration of space, let's recall that even before ... read more

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