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Astronomy Picture of the Day -- Galaxy Cluster Abell 1689 Deflects Light
NASA ^ | September 17, 2013 | (see photo credit)

Posted on 09/17/2013 3:58:07 AM PDT by SunkenCiv

Explanation: It is one of the most massive objects in the visible universe. In this view from the Hubble Space Telescope's Advanced Camera for Surveys, Abell 1689 is seen to warp space as predicted by Einstein's theory of gravity -- deflecting light from individual galaxies which lie behind the cluster to produce multiple, curved images. The power of this enormous gravitational lens depends on its mass, but the visible matter, in the form of the cluster's yellowish galaxies, only accounts for about one percent of the mass needed to make the observed bluish arcing images of background galaxies. In fact, most of the gravitational mass required to warp space enough to explain this cosmic scale lensing is in the form of still mysterious dark matter. As the dominant source of Abell 1689's gravity, the dark matter's unseen presence is mapped out by the lensed arcs and distorted background galaxy images. Surprisingly, close inspection of the above image has revealed the presence of over 100,000 globular star clusters in the galaxy cluster.

September 17, 2013

(Excerpt) Read more at ...

TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: abell1689; apod; astronomy; science
[Credit: NASA, ESA, Hubble Heritage Team (STScI/AURA), and J. Blakeslee (NRC Herzberg, DAO) & H. Ford (JHU)]

1 posted on 09/17/2013 3:58:07 AM PDT by SunkenCiv
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To: StayAt HomeMother; Ernest_at_the_Beach; decimon; 1010RD; 21twelve; 24Karet; 2ndDivisionVet; ...
The Big One

2 posted on 09/17/2013 3:58:31 AM PDT by SunkenCiv (It's no coincidence that some "conservatives" echo the hard left.)
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To: SunkenCiv

What is that large circle? A filtering error?

3 posted on 09/17/2013 5:24:19 AM PDT by Domangart
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To: Domangart

The boundaries of the gravitational lens.

Either that of the flux capacitor is transmogrified.

4 posted on 09/17/2013 6:15:28 AM PDT by shibumi (Cover it with gas and set it on fire.)
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To: SunkenCiv

Astounding, Mr. Civilizations.

They’re still blaming “dark matter” I see.

5 posted on 09/17/2013 2:39:21 PM PDT by TheOldLady
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