The sky on
your birthday.
G21.5-0.9: A Supernova's Cosmic Shell
This cosmic shell, G21.5-0.9, is the remnant of a supernova explosion. A star nearly 20 times the mass of the Sun blasted away its outer layers. As the debris cloud expanded, shock waves heated the gas, causing it to glow in X-rays. This process creates shells that can be observed across the universe.
We cannot put this date's photograph on paper at poster size. We can print the nearest public archive plate to your date instead.
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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 Earth on your day The Earth on 21 April 2005 · Red Sea See it as a poster -
Released on 21 April 2010 VISTA’s infrared view of the Cat’s Paw Nebula* See it as a poster -
Released on 21 April 2010 Highlights from VISTA’s infrared view of the Cat’s Paw Nebula See it as a poster -
Released on 21 April 2025 A glittering cluster shines again See it as a poster -
Released on 21 April 2016 The Bubble Nebula See it as a poster -
Released on 21 April 2016 Wide-field image of the Bubble Nebula (ground-based image) See it as a poster
In tropical astrology, 21 APR 2005 falls under Taurus (♉). The sign's window runs from 04-20 through 05-20. Taurus holds the Pleiades star cluster and Aldebaran, the red giant that marks the eye of the Bull. The Sun was crossing this region of the sky on 21 APR 2005.
Questions about April 21, 2005
What space photo was released on April 21, 2005?
NASA's Astronomy Picture of the Day for April 21, 2005 was "G21.5-0.9: A Supernova's Cosmic Shell". It's the card at the top of this page.
What was the Moon's phase on April 21, 2005?
A waxing gibbous moon, about 93% lit.
What day of the week was April 21, 2005?
April 21, 2005 was a Thursday, day 111 of the 365 days in 2005.
Was there a meteor shower on April 21, 2005?
Yes: the Lyrid shower, peaks tomorrow.
What did the Sun and the Earth look like on April 21, 2005?
NASA's Terra satellite photographed the whole Earth that day. It's 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.