Astronomy Picture of the Day ·

Cluster Crash Illuminates Dark Matter Conundrum

The Astronomy Picture of the Day for August 20, 2007 is “Cluster Crash Illuminates Dark Matter Conundrum,” an image. It is credited to Credit: X-ray: NASA / CXC / U. Victoria / A. Mahdavi et al. Optical/Lensing: CFHT / U. Victoria / A. Mahdavi et al.. The original explanation runs about 188 words.

Cluster Crash Illuminates Dark Matter Conundrum
Credit: X-ray: NASA / CXC / U. Victoria / A. Mahdavi et al. Optical/Lensing: CFHT / U. Victoria / A. Mahdavi et al. Shown from science.nasa.gov. Not hosted by OpenOrbit.

From the explanation

“Huge clusters of galaxies are surely colliding in Abell 520 but astrophysicists aren’t sure why the dark matter is becoming separated from the normal matter.”

— APOD editors, August 20, 2007

Read the full explanation on science.nasa.gov

At a glance

Date
August 20, 2007
Type
Image
Credit
Credit: X-ray: NASA / CXC / U. Victoria / A. Mahdavi et al. Optical/Lensing: CFHT / U. Victoria / A. Mahdavi et al.
Copyright
No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
Explanation length
About 188 words

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Topics in this entry

Galaxies

Topics are matched from words in the title and explanation.

On this day: August 20 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.