   This week, while most of us are sitting down to a
Thanksgiving meal, astronomers around the world will be working,
looking up at an unusual comet passing near the sun. NPR's Geoff
Brumfiel has the story of what some are calling the comet of the
century.  GEOFF BRUMFIEL, BYLINE: The story of comet ISON
started in September of last year, when a pair of astronomers in
Russia spotted it out beyond the orbit of Jupiter. Two things
stood out right away: First, ISON was really bright. Second, it
was going to pass close to the sun and the Earth. That's led to
a lot of excitement. The Science Channel even has a documentary
in the works.   UNIDENTIFIED NARRATOR: ISON has arrived. But
where does it go from here?  KARL BATTAMS: The media caught wind
of it before reasonable astronomers could catch wind of it. And
so suddenly, everyone started talking about "the comet of the
century."  BRUMFIEL: Karl Battams is a reasonable astrophysicist
as the Naval Research Laboratory. Despite the hype, the comet
isn't easily visible