October 31, 1938 was the day after Martians encountered planet Earth, and
everything was calm. Reports of the invasion were revealed to be part of a
Halloween radio drama, the now famous broadcast based on H.G. Wells' scifi
novel War of the Worlds. On Mars October 20, 2014 was calm too, the day after
its close encounter with Comet Siding Spring. Not a hoax, this comet really did
come within 86,700 miles or so of Mars, about 1/3 the Earth-Moon distance.
Earth's spacecraft and rovers in Mars orbit and on the surface reported no ill
effects though, and had a ringside seat as a visitor from the outer solar
system passed by. Spanning over 2 degrees against stars of the constellation
Ophiuchus, this colorful telescopic snapshot captures our view of Mars on the
day after. Bluish star 51 Ophiuchi is at the upper right and the comet is just
emerging from the Red Planet's bright glare.
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