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[4] 80% were found to have very broad Balmer emission lines, suggesting that they are active galactic nuclei (AGN) and host supermassive black holes at their center. [7] Active galactic nuclei are defined as small regions in the centers of galaxies that emit copious amounts of energy in the form of bright jets and winds.
A Yuanfeng Tongbao (元豐通寶) cash coin from the Northern Song dynasty with a "flower (or 'rosette') hole" in the middle.. Cash coins with flower (rosette) holes (traditional Chinese: 花穿錢; simplified Chinese: 花穿钱; pinyin: huā chuān qián) are a type of cash coin with an octagonal hole as opposed to a square one, they have a very long history possibly dating back to the first ...
Nevertheless, while a diamond is being formed, it may not totally crystallize, leading to the presence of small dots of black carbon. These black spots have been classified to be those of graphite, pyrrhotite and pentlandite. These surface flaws resemble a small black dot and may affect the clarity of the stone depending on the size of the ...
Scientists confirm an 8,200-solar-mass black hole in the Omega Centauri cluster using 20 years of Hubble data, shedding light on black hole formation and evolution.
It is called preauricular sinus which, according to the U.S. National Institutes of Health, or NIH, "generally appears as a tiny skin-lined hole or pit, often just in front of the upper ear where ...
A mascle is a voided lozenge—that is, a lozenge with a lozenge-shaped hole in the middle—and the rarer rustre is a lozenge containing a circular hole. A field covered in a pattern of lozenges is described as lozengy; a similar field of mascles is masculy.
According to the Independent, the idea was conjured up by the French company, Bic, who added the holes to prevent people from choking to death if they were to accidentally swallow one.
Animation of the missing square puzzle, showing the two arrangements of the pieces and the "missing" square Both "total triangles" are in a perfect 13×5 grid; and both the "component triangles", the blue in a 5×2 grid and the red in an 8×3 grid.