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 May 30
The featured image shows crepuscular rays emanating from below the horizon and appearing quite red. Please see the explanation for more detailed information.

Red Crepuscular Rays from an Eclipse
Image Credit & Copyright: Fefo Bouvier

What is happening behind that island? Things were expected and unexpected. The rays of light pictured are called crepuscular rays. The Sun was being partially overshadowed by the Moon late last month. The Sun's rays are bright as they shine through gaps in below-horizon clouds. The red crepuscular rays are likely caused by an abundance of aerosols in Earth's atmosphere scattering away the blue light. A memorable scene featuring both the Moon and the Sun was expected. Clouds obscured the eclipse from this location, which wasn't completely unexpected. The beauty of bright red crepuscular rays emerged after packing up. That island on the horizon is actually two islands.

Tomorrow's picture: yellow liquid sun < | 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
& 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 May 31
The featured image shows a Falon 9 rocket transiting in front of the Sun in mid May. The heat from the rocket's
exhaust makes the Sun's outline appear to ripple.
Please see the explanation for more detailed information.

Rocket Transits Rippling Sun
Image Credit & Copyright: Michael Cain

The launch of a rocket at sunrise can result in unusual but intriguing images that feature both the rocket and the Sun. The Starlink satellites were carried into low Earth orbit last month when a SpaceX Falcon 9 rocket blasted off from the Kennedy Space Center. In the featured launch picture, the rocket's exhaust plume glows beyond its projection onto the distant Sun, the rocket itself appears jagged, and the Sun's lower edge shows peculiar ripples. The physical cause of all of these effects is pockets of relatively hot or rarefied air. The sunspot region on the upper left crosses the Sun slowly.

Tomorrow's picture: big dragons

< | 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
& Michigan Tech. U.