This was
your sky.
NGC 6240: Merging Galaxies
NGC 6240 is a pair of merging galaxies about 400 million light-years away in Ophiuchus. This cosmic catastrophe is in its final stages, with the galaxies spewing distorted tidal tails of stars, gas, and dust. The collision also triggers rapid bursts of star formation. Eventually, the two supermassive black holes in their cores will combine, forming a single, more massive black hole, leaving behind one large galaxy.
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In tropical astrology, 21 MAY 2015 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 21 MAY 2015.