What does the largest moon in the Solar System look like? Ganymede, larger than even Mercury and Pluto, has a surface speckled with bright young craters overlying a mixture of older, darker, more cratered terrain laced with grooves and ridges
Solar eruption A long filament of solar material that had been hovering in the sun's corona erupts out into space on Aug. 31. Traveling at over 900 miles per second, the coronal mass ejection (CME) did not travel directly toward Earth, but it did connect with Earth's magnetosphere, causing auroras to appear in the night sky on Sept. 3.
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