Cover Stories:

• Messier catalog of 109 sky treats

• Window into the violent universe: Extreme Stars; Superdense neutron stars show astronomers exotic worlds of pressure, magnetism, and gravity

• What makes stars explode?

• See winter's best planetary nebulae

• Mars updates

• Secrets of the brightest galaxies

• Touchdowns on other worlds illustrated

• How to search for supernovae

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