The sky on
your birthday.
Confirmed Muon Wobble Remains Unexplained
The muon, a particle similar to a heavy electron, has an unexpected wobble. Experiments like g-2 have shown this wobble to be larger than predicted by the Standard Model of Particle Physics. This discrepancy suggests that our understanding of fundamental particles is incomplete.
Heavy matte paper, about 200 gsm, printed in the United States and shipped free. The card stays free, the print is the thing you keep.
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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 13 April 2021 See it as a poster -
The Earth on your day The Earth on 13 April 2021 · Caspian Sea See it as a poster -
Released on 13 April 2011 Wide Field Imager view of the star formation region NGC 3582 See it as a poster -
Released on 13 April 2026 NGC 602 and Beyond See it as a poster -
Released on 13 April 2015 Young and dynamic See it as a poster -
Released on 13 April 2011 Wide-field view of the sky around NGC 3582 See it as a poster -
Released on 13 April 2004 Star Formation in the DR21 Region B See it as a poster
In tropical astrology, 13 APR 2021 falls under Aries (♈). The sign's window runs from 03-21 through 04-19. Aries is the constellation traditionally tied to spring's arrival in the northern hemisphere. The Sun was crossing this region of the sky on 13 APR 2021.
Questions about April 13, 2021
What space photo was released on April 13, 2021?
NASA's Astronomy Picture of the Day for April 13, 2021 was "Confirmed Muon Wobble Remains Unexplained". It's the card at the top of this page.
What was the Moon's phase on April 13, 2021?
A new moon, about 2% lit.
What day of the week was April 13, 2021?
April 13, 2021 was a Tuesday, day 103 of the 365 days in 2021.
What did the Sun and the Earth look like on April 13, 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.