[ExI] Asteroid on track for possible (updated probability of 1:28) Mars hit

[Kevin H]

Thanks Amara,

I wasn't aware of SPICE before and this discovery of 2007 WD5 has brought a
resurge in interest in astronomy for me, specifically what I think you'd
call celestrial mechanics or solar system dynamics.  For instance, it still
astounds me how they can predict that Apophis will get *so* close to the
Earth, and yet miss it when it swings by in 2029 as well as miss the
gravitational "keyhole" that will put it at risk in 2036.  It just amazes me
the accuracy of these predictions (although, of course, the flyby hasn't
happened yet).

Best regards,

Kevin
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