The sky on
your birthday.
M87's Central Black Hole in Polarized Light
This image shows the intrinsic spin direction, or polarization, of radio waves from the supermassive black hole at the center of elliptical galaxy M87. These radio waves are produced by the powerful magnetic field surrounding the black hole. The data for this image was collected by the Event Horizon Telescope, a global network of radio telescopes, revealing the structure of the black hole's jets.
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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 March 2021 See it as a poster -
The Earth on your day The Earth on 31 March 2021 · Sahara, Algeria See it as a poster -
Released on 31 March 2010 Around the star-formation region Gum 19 (RCW 34) See it as a poster -
Released on 31 March 2025 A galaxy that gives great feedback See it as a poster -
Released on 31 March 2016 The galactic centre See it as a poster -
Released on 31 March 2005 Hubble spies cosmic dust bunnies See it as a poster -
Released on 31 March 2020 Ground-Based View of J2150−0551 Region See it as a poster
In tropical astrology, 31 MAR 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 31 MAR 2021.
Questions about March 31, 2021
What space photo was released on March 31, 2021?
NASA's Astronomy Picture of the Day for March 31, 2021 was "M87's Central Black Hole in Polarized Light". It's the card at the top of this page.
What was the Moon's phase on March 31, 2021?
A waning gibbous moon, about 90% lit.
What day of the week was March 31, 2021?
March 31, 2021 was a Wednesday, day 90 of the 365 days in 2021.
What did the Sun and the Earth look like on March 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.