This was
your sky.
An Unexpected Flare from the Crab Nebula
The Crab Nebula, a supernova remnant, unexpectedly flares in gamma rays. Discovered over the past few years, this behavior is specific to very high-energy light. A month ago, the Fermi Gamma Ray Space Telescope observed an increase in gamma-ray brightness, becoming about five times its usual level, then fading in a few days. The cause of these flares remains a mystery.
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In tropical astrology, 23 MAY 2011 falls under Gemini (♊). The sign's window runs from 05-21 through 06-20. Gemini is named for the twin stars Castor and Pollux, both bright enough to spot without a telescope. The Sun was crossing this region of the sky on 23 MAY 2011.