NGC3198 - Iotw2035a

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Shortlink:

https://dewiki.de/b/303441

Quelle:

Wikimedia Commons

Größe:

3168 x 2485 Pixel (2706394 Bytes)

Beschreibung:

A Lonely Spiral in a Tapestry of Galaxies

This stunning image features NGC 3198, a galaxy that lies about 47 million light-years away in the constellation Ursa Major. This image was taken with the Mosaic instrument on the 4-meter Nicholas U. Mayall Telescope at Kitt Peak National Observatory, a Program of NSF’s NOIRLab, and shows the full extent of the galaxy, from the bright central bulge to the tenuous outer reaches of the tightly-wound spiral arms. Almost all the objects lurking in the background are galaxies or galaxy clusters — a sea of distant galaxies of all shapes, sizes, and orientations.

Accurately measuring the distance to an astronomical object — everything from our own Sun to galaxies such as NGC 3198 — is an age-old challenge for astronomers, and requires a combination of measurements and methods. The galaxy at the heart of this image has played a part in this astronomical undertaking by allowing astronomers to calibrate astronomical distance measurements based on a type of variable star known as a Cepheid variable.

Credit:

KPNO/NOIRLab/NSF/AURA.

Acknowledgments: PI: M T. Patterson (New Mexico State University)

Image processing: Travis Rector (University of Alaska Anchorage), Mahdi Zamani & Davide de Martin

Lizenz:

CC BY 4.0

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