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Space Pictures This Week: Pink Nebula, Moon Map, More

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Mercury
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« on: November 19, 2011, 07:20:27 pm »



Hercules! Hercules!

Photograph courtesy Rolando Ligustri

Comet Garradd (aka C/2009 P1), as seen from Italy's Cast Observatory on November 13, rockets through the region of the constellation Hercules. From the Northern Hemisphere, Garradd should be visible with binoculars through January, according to Sky & Telescope.

Comets are balls of rock and ice that grow tails as they approach the sun in the course of their highly elliptical orbits.

As comets heat up, gas and dust are expelled and trail behind them. The sun illuminates this trail, thereby making it sometimes visible in the night sky.

(See "New Comet Found; May Be Visible From Earth in 2013.")

Published November 18, 2011
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