NASAのインスタグラム(nasa) - 3月25日 23時15分

Cosmic Kaleidoscope: At first glance, this cosmic kaleidoscope of purple, blue and pink offers a strikingly beautiful - and serene - snapshot of the cosmos. However, this multi-colored haze actually marks the site of two colliding galaxy clusters, forming a single object. The cluster is located about 4.3 billion light-years from Earth.

As with all galaxy clusters, this one contains a significant amount of dark matter, which leaves a detectable imprint in visible light by distorting the images of background galaxies. In this image, this dark matter appears to align well with the blue-hued hot gas, suggesting that the two clusters have not yet collided; if the clusters had already smashed into one another, the dark matter and gas would have separated. It also contains other features - such as a compact core of hot gas - that would likely have been disrupted had a collision already occurred.

Image credit: NASA, ESA, CXC, NRAO/AUI/NSF, STScI, and G. Ogrean (Stanford University), Acknowledgment: NASA, ESA, and J. Lotz (STScI), and the HFF team

#nasa #space #galaxy #hubble #chandra #astronomy #nasabeyond #darkmatter #cosmos #science

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