(meteorobs) probably a meteor -- daytime sonic boom

[dberesford at adam.com.au]

 Its actually tens of thousand of miles for  the Mars-comet distance
of comet siding spring,but of course the coma is about that radius
anywayThe datails can be found on the JPL news channelTony
BeresfordAdelaide South Australia

 In a few days a Comet, the size of a mountain will fly by Mars at a
relative
 33 Miles per second, passing a few thousand miles from its surface.
Luckily
 the Solar System has been swept clear of most of these large objects
perhaps
 hundreds of millions of years ago, or else our planet would not be
as
 friendly a place to live as it is now, however, since there are so
many of
 us on the surface of the Earth, some are an easy target for much
smaller and
 more numerous objects.

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