The sky on
your birthday.
The Red Rectangle Nebula from Hubble
The Red Rectangle Nebula, imaged by Hubble, has an unusual shape. An aging binary star system at its center powers the nebula, but its colors are still a mystery. The nebula's distinct rungs suggest the outflow of material occurs in fits and starts. Its X-shape is likely due to a thick dust torus pinching the outflow into cone shapes.
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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 2013 See it as a poster -
The Earth on your day The Earth on 21 May 2013 · Pilbara, Western 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 2015 NGC 6240: Merging Galaxies 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
In tropical astrology, 21 MAY 2013 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 2013.
Questions about May 21, 2013
What space photo was released on May 21, 2013?
NASA's Astronomy Picture of the Day for May 21, 2013 was "The Red Rectangle Nebula from Hubble". It's the card at the top of this page.
What was the Moon's phase on May 21, 2013?
A waxing gibbous moon, about 86% lit.
What day of the week was May 21, 2013?
May 21, 2013 was a Tuesday, day 141 of the 365 days in 2013.
What did the Sun and the Earth look like on May 21, 2013?
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.