Civil War painting of Union and Confederate troops fighting at The Battle of Antietam
Vintage Civil War painting of Union and Confederate troops fighting at The Battle of Antietam, also known as the Battle of Sharpsburg
© John Parrot/Stocktrek Images
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Artists concept of an impact crater on Jupiters moon Ganymede, with Jupiter
Artist's concept of an impact crater on Ganymede, about 10 miles in diameter, dominates a scene otherwise defined by a dozen long ridges. In the middle of the crater is a central peak, formed when the energy of the impact liquefied the crust long enough for it to rebound upward and solidify once again.
Immediately above the horizon, Jupiter is still a majestic spectacle, even at a distance of nearly three times that between the Earth and its moon. Much closer on the upper right is Ganymede's sister satellite Europa. At a distance of 307 thousand miles from this vantage point, Europa is only a quarter again as far as the Earth is from its moon. To the lower left of Jupiter at nearly a million miles is Jupiter's volcanic satellite Io.
Jupiter's largest satellite Ganymede has a varying surface, some of which is characterized by rumpled bundles of ridges and grooves that run for hundreds of miles over a frozen surface of water-ice. They probably formed long ago when tectonic forces pulled apart Ganymede's upper crust; similar sets of faults occur in rift zones on Earth, as in eastern Africa. Subsequent meteoritic impacts have peppered, and broken in places, the continuity of the running formations
© Walter Myers/Stocktrek Images