The sky on
your birthday.
Centaurus A's Warped Magnetic Fields
When galaxies collide, their magnetic fields warp. NASA's SOFIA, a flying 747, observed Centaurus A to study this. Centaurus A's unusual shape comes from two colliding galaxies and jets powered by a central supermassive black hole. The image shows magnetic field lines derived from SOFIA data, superposed on visible and submillimeter light.
We cannot put this date's photograph on paper at poster size. We can print the nearest public archive plate to your date instead.
Prints are coming soon. The card is free to save and share in the meantime.
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 April 2021 See it as a poster -
The Earth on your day The Earth on 21 April 2021 · Lake Eyre, Australia 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 2021 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 2021.
Questions about April 21, 2021
What space photo was released on April 21, 2021?
NASA's Astronomy Picture of the Day for April 21, 2021 was "Centaurus A's Warped Magnetic Fields". It's the card at the top of this page.
What was the Moon's phase on April 21, 2021?
A first quarter moon, about 69% lit.
What day of the week was April 21, 2021?
April 21, 2021 was a Wednesday, day 111 of the 365 days in 2021.
Was there a meteor shower on April 21, 2021?
Yes: the Lyrid shower, peaks tomorrow.
What did the Sun and the Earth look like on April 21, 2021?
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.