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First Aurora Seen on Mars - Universe Today
The European Space Agency's Mars Express spacecraft has discovered an aurora in the Martian atmosphere. In addition to Earth, auroras have been discovered on Venus, Jupiter, Saturn, Uranus and Neptune, but not Mars... until now. Mars has no intrinsic planetary magnetic field, so the aurora formed above a pocket of rock that was still magnetic. This aurora was only 30 km (19 miles) long, and very faint. An astronaut on Mars would probably see the aurora as very faint and blue, if at all.