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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.

The featured image shows a a sunset with the planets Venus, Saturn, Jupiter, the Moon, and Uranus all in a row. Please see the explanation for more detailed information.

Planetary Alignment over Italy

Explanation: It is not a coincidence that planets line up. That's because all of the planets orbit the Sun in (nearly) a single sheet called the plane of the ecliptic . When viewed from inside that plane -- as Earth dwellers are likely to do -- the planets all appear confined to a single band . It is a coincidence, though, when three of the brightest planets all appear in nearly the same direction. Such a coincidence was captured earlier this month. Featured above (right to left), Venus , Saturn , and Jupiter were all imaged together in a line just after sunset, from the San Fermo Hills , Bergamo , Italy . Joining the alignment are Earth's Moon , and the position of the more distant Uranus . Bands of clouds streak across the sky toward the setting Sun . As Comet Leonard fades, this planetary alignment -- absent the Moon -- should persist for the rest of the month.

Discovery + Outreach: Graduate student research position open for APOD

Date December 19, 2021
Credit Image Credit & Copyright: Antonio Finazzi
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.