One of the favorite topics of our news is about moon landing. So, on this day (on September 20, 1970) the Soviet Union's Luna 16 moon probe landed on the moon.
NASA’s Chandra X-ray Observatory captured how behaves the hot gas in the cluster Abell 2052 in X-ray (blue) range. The hot, X-ray bright gas has an average temperature of about 30 million degrees. Like wine in a glass, vast clouds of hot gas are sloshing back and forth in Abell 2052. A galaxy cluster Abell 2052 located about 480 million light years from Earth. A huge spiral structure in the hot gas, spanning almost a million light years, is seen around the outside of the image, surrounding a giant elliptical galaxy at the center. As the smaller cluster approached, the dense hot gas of the central cluster was attracted to it by gravity. After the smaller cluster passed the cluster core, the direction of motion of the cluster gas reversed and it traveled back towards the cluster center.
The cluster gas moved through the center again and “sloshed” back and forth, similar to wine sloshing in a glass that was jerked sideways. The sides of the glass push the wine back to the center, whereas in the cluster the gravitational force of the matter in the clusters pulls it back. The sloshing gas ended up in a spiral pattern because the collision between the two clusters was off-center. This type of sloshing in Abell 2052 has important physical implications.It helps push some of the more dense, cooler gas located in the center of the cluster, where temperatures are only about 10 million degrees, farther away from the core. This helps prevent further cooling of this gas in the core and could limit the amount of new stars being formed in the central galaxy. Sloshing motions like those seen in Abell 2052 also redistribute heavy elements, like iron and oxygen, which are forged in supernova explosions. These elements are used in the future generations of stars and planets and are necessary for life as we know it.
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