View Full Version : Here’s Ceres Compared to All the Other Asteroids We’ve Visited

2015-Jan-19, 09:20 PM
When the Dawn mission was in its planning stages, Ceres was considered an asteroid. But in 2006, a year before the mission launched, the International Astronomical Union formed a new class of solar system objects known as dwarf planets, and since by definition a dwarf planet is spherical and travels in an orbit around the […]

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