Astronomy Picture of the Day ·

Abell 370: Galaxy Cluster Gravitational Lens

The Astronomy Picture of the Day for September 21, 2009 is “Abell 370: Galaxy Cluster Gravitational Lens,” an image. It is credited to Credit: NASA , ESA , and the Hubble SM4 ERO Team & ST-ECF. The original explanation runs about 229 words.

Abell 370: Galaxy Cluster Gravitational Lens
Credit: NASA , ESA , and the Hubble SM4 ERO Team & ST-ECF Shown from science.nasa.gov. Not hosted by OpenOrbit.

From the explanation

“What is that strange arc? While imaging the cluster of galaxies Abell 370, astronomers had noted an unusual arc to the right of many cluster galaxies.”

— APOD editors, September 21, 2009

Read the full explanation on science.nasa.gov

At a glance

Date
September 21, 2009
Type
Image
Credit
Credit: NASA , ESA , and the Hubble SM4 ERO Team & ST-ECF
Copyright
No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
Explanation length
About 229 words

All of September 2009 → · 2009 by month → · Full archive since 1995 →

Topics in this entry

Galaxies

Topics are matched from words in the title and explanation.

On this day: September 21 in other years

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Source

Copy taken Oct 28, 2026, 2:39 AM EDT. The image and explanation belong to their creators. OpenOrbit is not affiliated with or endorsed by NASA.