The sky on
your birthday.
“Dark Matter in a Simulated Universe” is copyrighted by Tom Abel & Ralf Kaehler (KIPAC, SLAC), AMNH. NASA has permission to show it and we don't, so it isn't on this card.
See it on NASA's siteThis dark matter map from the American Museum of Natural History's Hayden Planetarium Space Show 'Dark Universe' illustrates how our universe might look if we could see dark matter. The gravity of unseen dark matter is the leading explanation for several cosmic phenomena. These include why galaxies rotate so fast, why galaxies orbit clusters so fast, why gravitational lenses strongly deflect light, and how visible matter is distributed.
The Sun on 31 October 2021
NASA SDO took this picture on 31 October 2021, the day itself, not a release date.
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 Sun on your day The Sun on 31 October 2021 See it as a poster -
The Earth on your day The Earth on 31 October 2021 · Pilbara, Western Australia See it as a poster -
Released on 31 October 2022 The Vela supernova remnant imaged by the VLT Survey Telescope See it as a poster -
Released on 31 October 2024 The Dark Wolf Nebula See it as a poster -
Released on 31 October 2025 Wide-field view around the RCW 94/95 nebulae See it as a poster -
Released on 31 October 2018 Wide-field view of the Serpens Nebula (ground-based image) See it as a poster -
Released on 31 October 2012 The globular star cluster NGC 6362 See it as a poster
In tropical astrology, 31 OCT 2021 falls under Scorpio (♏). The sign's window runs from 10-23 through 11-21. Scorpio is marked by Antares, a red supergiant the size of Mars's orbit. The Sun was crossing this region of the sky on 31 OCT 2021.
Questions about October 31, 2021
What space photo was released on October 31, 2021?
NASA's Astronomy Picture of the Day for October 31, 2021 was "Dark Matter in a Simulated Universe". It's a photographer's copyrighted image, so we link to it on NASA's site and show the Sun or the Earth that day instead.
What was the Moon's phase on October 31, 2021?
A waning crescent moon, about 21% lit.
What day of the week was October 31, 2021?
October 31, 2021 was a Sunday, day 304 of the 365 days in 2021.
What did the Sun and the Earth look like on October 31, 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.