Comet 2013 A1: Rendezvous with Mars…

Here’s something to think about whilst waiting to see if Comet ISON will fizzle, or sizzle.  The latest Science at Nasa video looks at the trajectory, and consequences for Mars missions, of Comet 2013 A1 (Siding Spring).  Discovered as recently as 3 January this year, this Oort cloud object will pass “extraordinarily close” to the planet Mars on 19 October 2014 – an actual collision, although unlikely, has not been ruled out yet [1:2000].  It’s estimated that an impact of the ~1-3 km-wide Comet 2013 A1, travelling at around …

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