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2024 June 23

The Colors of Saturn from Cassini Image Credit: NASA, ESA, JPL, ISS, Cassini Imaging Team; Processing & License: Judy Schmidt

Explanation: What creates Saturn’s colors? The featured picture of Saturn only slightly exaggerates what a human would see if hovering close to the giant ringed world. The image was taken in 2005 by the robot Cassini spacecraft that orbited Saturn from 2004 to 2017. Here Saturn’s majestic rings appear directly only as a curved line, appearing brown, in part from its infrared glow. The rings best show their complex structure in the dark shadows they create across the upper part of the planet. The northern hemisphere of Saturn can appear partly blue for the same reason that Earth’s skies can appear blue – molecules in the cloudless portions of both planet’s atmospheres are better at scattering blue light than red. When looking deep into Saturn’s clouds, however, the natural gold hue of Saturn’s clouds becomes dominant. It is not known why southern Saturn does not show the same blue hue – one hypothesis holds that clouds are higher there. It is also not known why some of Saturn’s clouds are colored gold.

∞ Source: apod.nasa.gov/apod/ap240623.html

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If you’ve visited the Museum, you’re certainly familiar with today’s Fossil Friday feature: the Barosaurus and Allosaurus in the Rotunda! Rising 50 ft (15 m) above the ground, it’s the world’s tallest freestanding dinosaur mount. In this scene, a Barosaurus rears up to defend her young from an Allosaurus. How does the huge skeleton of Barosaurus—whose name means “heavy reptile”—stay up? The Barosaurus is built from casts of real fossil bones, while the originals are housed in the Museum’s collections. Real fossil bones would be too heavy to support this way.

Photo: D. Finnin / © AMNH

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🎃 kitty and her pumpkin coven 🎃

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Winter views, Sweden

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Back to the Autumn | Alex Kaßner