Today's Top Story : earth science
December Thursday 08, 2016 at 14:35
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Today's Picture

Not a comet ,bright spiral galaxy Messier 51 is popularly known as theWhirlpool Galaxy.Just off the handle of the Big Dipper in northern skies, you canspot it at the upper left in this image from December 1st.The pretty 4 by 2.5 degree wide field of view does containtwo comets though.Different in appearance, both comets are new visitors to the innerSolar System and are currently faint telescopic objects, highest above northern horizons in morning twilight.At lower left newly discovered comet NEOWISE ( C/2016 U1 )shows off a round fuzzy coma in the greenish light of diatomic carbon gasfluorescing in sunlight.Sunlight reflects from dust in the coma and stubby tail of comet Johnson( C/2015 V2 )at upper right.


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