Explanation: How impressive will Comet
ISON become? No one is sure, but unfortunately, as the comet approaches the
inner Solar System, it is brightening more slowly than many early predictions.
Pictured above, Comet ISON is seen about two weeks ago as >it continued to
develop a tail. Last week the comet passed relatively close to Mars, and was
directly imaged by the Mars Reconnaissance Orbiter. When Comet ISON dives to
within a few solar radii of the Sun's >surface in late November, it may
become brighter than the Moon and sport a long and >flowing tail -- or it
may appear somewhat less spectacular. Either way, sky enthusiasts hope that
whatever comet parts survive will put on quite an impressive show, as viewed
from Earth, through at least the rest of the year.
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