Cover Stories:

• How great comets have shaped history

• Explore Jupiter's moons

• Journey to the center of the Milky Way

• Astronomers target the black hole at the heart of our galaxy

• Latest images from Mars

• What it's like to observe from the darkest skies

• On the trail of hydrogen's heavy sibling

• Meade's mySky teaches you the stars

• View winter's forgotten star clusters

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