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

PANSTARRS information

Comet C/2012 S1 (ISON)

ISON information

Web Extras

Does Pluto have rings?

Planetary scientist Alan Stern fills us in on the possibility.
Published: April 21, 2006
After our team discovered Pluto's small moons, we realized impacts on them might generate ejecta that gets into orbit around Pluto, creating rings around the planet. Rings have so far been discovered only around our solar system's gas-giant planets.
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