This blog tells you about amazing space facts and it's free to read.
Saturday 20 February 2010
Callisto (One of Jupiters moons)
Callisto's dark and dirty,icy crust is coverd with craters.The largest,Valhalla,has shockwaves that spread out some 3,000 km (1,865 miles).Astronomers believe the crust hides a rocky core.
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