The sky on
your birthday.
SN Refsdal: The First Predicted Supernova Image
SN Refsdal is the first predicted supernova image, appearing multiple times due to a cosmic lens. The supernova itself occurred only once, far behind the galaxy cluster MACS J1149.5+2223. The cluster's gravity acted as a lens, splitting the supernova's light into several bright images. This allowed astronomers to predict when it would reappear.
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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 21 December 2015 See it as a poster -
The Earth on your day The Earth on 21 December 2015 · Nile Delta and Sinai See it as a poster -
Released on 21 December 2006 Portrait of a dramatic stellar crib* See it as a poster -
Released on 21 December 2022 A Wreath of Star Formation in NGC 7469 See it as a poster -
Released on 21 December 2009 Star Cluster R136 Bursts Out See it as a poster -
Released on 21 December 2023 Webb spots a second lensed supernova in a distant galaxy See it as a poster -
Released on 21 December 2020 Saturn and Jupiter Conjunction See it as a poster
In tropical astrology, 21 DEC 2015 falls under Sagittarius (♐). The sign's window runs from 11-22 through 12-21. Sagittarius points straight at the center of the Milky Way, our galaxy's brightest region. The Sun was crossing this region of the sky on 21 DEC 2015.
Questions about December 21, 2015
What space photo was released on December 21, 2015?
NASA's Astronomy Picture of the Day for December 21, 2015 was "SN Refsdal: The First Predicted Supernova Image". It's the card at the top of this page.
What was the Moon's phase on December 21, 2015?
A waxing gibbous moon, about 78% lit.
What day of the week was December 21, 2015?
December 21, 2015 was a Monday, day 355 of the 365 days in 2015.
Was there a meteor shower on December 21, 2015?
Yes: the Ursid shower, peaks tomorrow.
What did the Sun and the Earth look like on December 21, 2015?
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.