The sky on
your birthday.
Colors: Ring Nebula versus Stars
The Ring Nebula, also known as M57, emits light primarily in a few distinct colors, mainly hydrogen (red) and oxygen (blue). This image uses a prism-like diffraction grating to separate these colors, showing them as nearly overlapping images to the left of the center. This technology allows us to see the individual colors of the nebula and surrounding stars, revealing their spectral makeup.
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 July 2021 See it as a poster -
The Earth on your day The Earth on 21 July 2021 · Madagascar See it as a poster -
Released on 21 July 2011 Stars in the Andromeda Galaxy’s halo with background galaxies (1) See it as a poster -
Released on 21 July 2011 Stars in the Andromeda Galaxy’s halo with background galaxies (2) See it as a poster -
Released on 21 July 2016 Wide-field image of Abell S1063 (ground-based image) See it as a poster -
Released on 21 July 2011 Stars in the Andromeda Galaxy’s disc See it as a poster -
Released on 21 July 2011 Stars in the Andromeda Galaxy’s giant stellar stream See it as a poster
In tropical astrology, 21 JUL 2021 falls under Cancer (♋). The sign's window runs from 06-21 through 07-22. Cancer is marked by the Beehive Cluster, M44, a loose family of stars visible to the naked eye on a dark night. The Sun was crossing this region of the sky on 21 JUL 2021.
Questions about July 21, 2021
What space photo was released on July 21, 2021?
NASA's Astronomy Picture of the Day for July 21, 2021 was "Colors: Ring Nebula versus Stars". It's the card at the top of this page.
What was the Moon's phase on July 21, 2021?
A waxing gibbous moon, about 89% lit.
What day of the week was July 21, 2021?
July 21, 2021 was a Wednesday, day 202 of the 365 days in 2021.
What did the Sun and the Earth look like on July 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.