APOD
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.
A Double Helix Lunar Eclipse
Explanation: The image was timed to capture a total lunar eclipse -- but it came with quite a twist. First, the eclipse : the fully Earth-shadowed Moon is visible as the orange orb near the top. The eclipsed Moon 's orange color is caused by a slight amount of red light scattered first by Earth's atmosphere , adding a color like a setting Sun . Now, the twist: one of the apparent double helix bands is the Milky Way , the central disk of our home galaxy. The second band is zodiacal light , sunlight scattered by dust in our Solar System . The reason they cross is because the plane where dust orbits our Sun is tilted relative to the plane where stars orbit our Galaxy. This well-known tilt is shown dramatically in the featured wide-angle Mercator-projected picture, spanning from horizon to horizon , captured in early September from Mingantu Observing Station in Inner Mongolia , China .
| Date | November 3, 2025 |
|---|---|
| Credit | Image Credit & Copyright: Chunlin Liu |
| Authors & editors: | Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) |
| A service of: |
ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U. |




