The sky on
your birthday.
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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Released on your day
Space pictures released on your month and day in other years, or a few days either side. Each one is sharp enough to print as a poster.
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The Sun on your day The Sun on 21 May 2015 See it as a poster -
The Earth on your day The Earth on 21 May 2015 · Lake Eyre, Australia See it as a poster -
Released on 21 May 2025 Wide-field view of the region of the sky around a ‘cosmic joust’ See it as a poster -
Released on 21 May 2014 The colourful star cluster NGC 3590 See it as a poster -
Released on 21 May 2025 City lights dot the southern United States' landscape See it as a poster -
Released on 21 May 2016 The familiar "boot" shape of the county of Italy stands out in this nighttime image with sparkling city lights reaching See it as a poster -
Released on 21 May 2022 The Moon, pictured the day before going into its Last Quarter phase, is seen from the International Space Station as it See it as a poster
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.
Questions about May 21, 2015
What space photo was released on May 21, 2015?
NASA's Astronomy Picture of the Day for May 21, 2015 was "NGC 6240: Merging Galaxies". It's the card at the top of this page.
What was the Moon's phase on May 21, 2015?
A waxing crescent moon, about 9% lit.
What day of the week was May 21, 2015?
May 21, 2015 was a Thursday, day 141 of the 365 days in 2015.
What did the Sun and the Earth look like on May 21, 2015?
NASA's Solar Dynamics Observatory photographed the Sun that day, and NASA's Terra satellite photographed the whole Earth. Both are on this page, next to the card.
Is it free?
Yes. Seeing, sharing and downloading the card is free, and there's no account to make.