The sky on
your birthday.
Mammatus Clouds Over Olympic Valley
The underside of a cloud is usually flat, but not always. These are mammatus clouds, named for their breast-like pouches of moisture. They form in turbulent air, often near a thunderstorm, as large water or ice droplets fall into clear air and evaporate. This photo captures them over Olympic Valley, California.
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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 20 February 2011 See it as a poster -
The Earth on your day The Earth on 20 February 2011 · Nile Delta and Sinai See it as a poster -
Released on 20 February 2013 The Lobster Nebula seen with ESO’s VISTA telescope See it as a poster -
Released on 20 February 2026 The stellar lifecycle in a nearby spiral See it as a poster -
Released on 20 February 2025 Messier 87 See it as a poster -
Released on 20 February 2017 Astronomical cooperation See it as a poster -
Released on 20 February 2017 ALMA’s hole in the Universe See it as a poster
In tropical astrology, 20 FEB 2011 falls under Pisces (♓). The sign's window runs from 02-19 through 03-20. Pisces holds the location of the spring equinox in the current astronomical era. The Sun was crossing this region of the sky on 20 FEB 2011.
Questions about February 20, 2011
What space photo was released on February 20, 2011?
NASA's Astronomy Picture of the Day for February 20, 2011 was "Mammatus Clouds Over Olympic Valley". It's the card at the top of this page.
What was the Moon's phase on February 20, 2011?
A waning gibbous moon, about 94% lit.
What day of the week was February 20, 2011?
February 20, 2011 was a Sunday, day 51 of the 365 days in 2011.
What did the Sun and the Earth look like on February 20, 2011?
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.