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ASTRONOMY PICTURE OF THE DAY

Discover the cosmos! Each day a different image or photograph of our fascinating
universe is featured, along with a brief explanation written by a professional
astronomer.

2022 July 18


Stephan's Quintet from Webb, Hubble, and Subaru
Image Credit: Webb, Hubble, Subaru; NASA, ESA, CSA, NOAJ, STScI; Processing &
Copyright: Robert Gendler

Explanation: OK, but why can't you combine images from Webb and Hubble? You can,
and today's featured image shows one impressive result. Although the recently
launched James Webb Space Telescope (Webb) has a larger mirror than Hubble, it
specializes in infrared light and can't see blue -- only up to about orange.
Conversely, the Hubble Space Telescope (Hubble) has a smaller mirror than Webb
and can't see as far into the infrared as Webb, but can image not only blue
light but even ultraviolet. Therefore, Webb and Hubble data can be combined to
create images across a wider variety of colors. The featured image of four
galaxies from Stephan's Quintet shows Webb images as red and also includes
images taken by Japan's ground-based Subaru telescope in Hawaii. Because image
data for Webb, Hubble, and Subaru are made freely available, anyone around the
world can process it themselves, and even create intriguing and scientifically
useful multi-observatory montages.



Stephan's Quintet from just: Webb, Hubble
Tomorrow's picture: half star cluster



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