Day: September 26, 2021

The Red Square Nebula

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How did a round star create this square nebula? No one is quite sure. The round star, known as MWC 922 and possibly part of a multiple star system, appears at the center of the Red Square Nebula. The featured image combines infrared exposures from the Hale Telescope on Mt. Palomar in California, and the Keck-2 Telescope on Mauna Kea in Hawaii. A leading progenitor hypothesis for the square nebula is that the central star or stars somehow expelled cones of gas during a late developmental stage. For MWC 922, these cones happen to incorporate nearly right angles and be visible from the sides. Supporting evidence for the cone hypothesis includes radial spokes in the image that might run along the cone walls. Researchers speculate that the cones viewed from another angle would appear similar to the gigantic rings of supernova 1987A, possibly indicating that a star in MWC 922 might one day itself explode in a similar supernova. via NASA https://ift.tt/3zHnAGJ

Wikipedia article of the day for September 26, 2021

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Wikipedia article of the day is British nuclear tests at Maralinga. Check it out: Article-Link Summary: British nuclear tests were conducted at Maralinga in the Woomera Prohibited Area in South Australia between 1956 and 1963. A total of seven major nuclear tests took place at Maralinga, with explosive yields ranging from approximately 1 to 27 kilotonnes of TNT (4 to 110 terajoules). Two major test series were conducted: Operation Buffalo (final test pictured) in 1956 and Operation Antler the following year. One bomb used cobalt pellets as a tracer for determining yield, resulting in rumours that Britain was developing a cobalt bomb. The site was also used for trials of neutron initiators and tests on the compression of nuclear weapon cores and the effects of fire on atomic weapons. It was left contaminated with radioactive waste, and a clean-up was attempted in 1967. A further clean-up was completed in 2000. In 1994, the Australian government paid $13.5Β million in compensation to the traditional owners, the Maralinga Tjarutja people. The land was restored to them in 2014.