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 December 23
The featured image shows a black and white image with
Saturn's orb dominating the image bottom and Saturn's rings
dominating the image top. Please see the explanation for more detailed information.

Cassini Looks Out from Saturn
Image Credit: NASA, JPL-Caltech, Space Science Institute

From inside the rings, this is whatSaturn looks like. For the first time in history, NASA directed a space craft to swoop between the planets. Hundreds of images were taken during the dive by the robotic vehicle. Looking back out, the craft was able to capture some great views. The featured image was taken a few hours before the closest approach and shows the unusual northern hexagon. The closest visible ring is the B ring, while the furthest ring is the F ring. After more than a decade of exploration and discovery, the Cassini spacecraft ran low on fuel and was directed to enter the atmosphere ofSaturn, where it melted.

Tomorrow's picture: the night before < | Archive | Submissions | Index | Search | Calendar | RSS | Education | About APOD | Discuss | >

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Phillip Newman Specific rights apply.
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A service of: ASD at NASA / GSFC,
NASA Science Activation
& Michigan Tech. U.


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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 December 24
See Explanation. Clicking on the picture will download
the highest resolution version available.

Comet 2022 E3 (ZTF)
Image Credit & Copyright: Dan Bartlett

Explanation: Comet C/2022 E3 (ZTF) was discovered by astronomers using the wide-field survey camera at the Zwicky Transient Facility this year in early March. Since then the new long-period comet has brightened substantially and is now sweeping across the northern constellation Corona Borealis in predawn skies. It's still too dim to see without a telescope though. But this fine telescopic image from December 19 does show the comet's brighter greenish coma, short broad dust tail, and long faint ion tail stretching across a 2.5 degree wide field-of-view. On a voyage through the inner Solar System comet 2022 E3 will be at perihelion, its closest to the Sun, in the new year on January 12 and at perigee, its closest to our fair planet, on February 1. The brightness of comets is notoriously unpredictable, but by then C/2022 E3 (ZTF) could become only just visible to the eye in dark night skies.

Tomorrow's picture: stars and mittens

< | Archive | Submissions | Index | Search | Calendar | RSS | Education | About APOD | Discuss | >

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Phillip Newman Specific rights apply.
NASA Web Privacy Policy and Important Notices
A service of: ASD at NASA / GSFC,
NASA Science Activation
& Michigan Tech. U.