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

PANSTARRS information

Comet C/2012 S1 (ISON)

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Web Extras

A pair of planetary conundrums

Some scientists think acid rain may not be the oddest form of precipitation on Venus. And on Saturn, researchers can’t measure precise wind speeds because they don’t know how fast the planet rotates.
By Michael Carroll
Published: June 27, 2011
Saturn-winds
Some scientists think acid rain may not be the oddest form of precipitation on Venus. And on Saturn, researchers can’t measure precise wind speeds because they don’t know how fast the planet rotates.
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