MARS COMET: This weekend, Comet Siding Spring (C/2013 A1) will make a
historically close approach to Mars. Satellites and rovers will get an
eye-full as the green comet passes less than 140,000 km above the Red
Planet's surface. No one knows what will happen. Possible side-effects
of the flyby include a Martian meteor shower and auroras.
information and amateur images of the comet approaching Mars may be
found on today's edition of http://spaceweather.com .