Year of the Comet
Comet C/2011 L4 (PANSTARRS)

PANSTARRS information

Comet C/2012 S1 (ISON)

ISON information

Web Extras

Galaxies collide in Andromeda

Computer simulations show the Andromeda Galaxy is consuming what was the seventh-largest galaxy in the Local Group.
By Richard Talcott
Published: January 24, 2008
Despite being some 13 billion years old, our Milky Way Galaxy still has a healthy appetite. Detailed observations of our home galaxy show several streams of stars — relics of dwarf galaxies being devoured by the Milky Way's strong gravity.
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