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

PANSTARRS information

Comet C/2012 S1 (ISON)

ISON information

The Sky This Month
May 2011

Tune into the most observable events in this month's sky.

Two-brightest-planets
May 2011: The stage is set for the finest planetary conjunction of the year.
By Martin Ratcliffe, Alister Ling // Published: March 28, 2011
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