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Comet Siding Spring's close shave by Mars last year provided a rare glimpse into how Oort Cloud comets behave, according to new research. The comet flew by Mars at a range of just 83,900 miles (135,000 kilometers) — close enough for the outer ridges of its tenuous atmosphere to pummel the planet with gas and dust.

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Double galaxy with a black hole in the center

Epically awesome photos of Mars

Geologists think that this textured terrain, which resembles features in the Colorado Plateau, formed when lava in the area cooled unusually quickly from flooding. For scale, the picture spans half a mile.