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Abell 31 (also known as Sh2-290 or PK 219+31.1 [2]) is an ancient planetary nebula in the constellation of Cancer. It is estimated to be about 2,000 light years away. Although it is one of the largest planetary nebulae in the sky, it is not very bright. The central star of the planetary nebula is a white dwarf with a spectral type of DAO. [3]
The discovery was published in 1966 in a list of 86 of old faint planetary nebulae known as the Abell Catalog of Planetary Nebulae. [3] In 1979 it was found that the centre of the Abell 30, as well as Abell 78 , was noticeably hotter and brighter than the rest of the nebula and features knots which were not visible in H-alpha . [ 4 ]
Spiral nebula surrounding NGC 262, which is one of the largest known galaxies. Ivory Nebula: 1,190,500 ly (365,000 pc) [2] Enormous Lyα nebula (ELAN) Also called MLAN1 at z=2.31. Another ELAN, called MLAN 10 is nearby. Q0042−2627 nebula 1,040,000 ly (320,000 pc) [10] Enormous Lyα nebula (ELAN) Around the quasar LBQS 0042-2627, at z=3.280
The following articles contain lists of nebulae: List of dark nebulae; List of diffuse nebulae; List of largest nebulae; List of planetary nebulae;
Cancer: Soccer Ball Nebula: Kronberger 61: 2011 13 18.4 Cygnus: IC 1454 1891 13.7 (approx.) 14 Cepheus: Abell 12: ... Eye of Sauron Nebula M 1-42: 10 14 Sagittarius
Credit - Photo-Illustration by TIME; Capelle.r/Getty Images; Artfully79/Getty Images. W hen the German philosopher Immanuel Kant puzzled over why nature looks beautiful to us, he considered the ...
In 2014 about 7,060 new cases of anal cancer were diagnosed in the United States (4,430 in women and 2,630 in men). [39] It is typically found in adults, average age early 60s. [39] In 2019, an estimated 8,300 adults will be diagnosed with anal cancer. [40] In the United States, an estimated 800 to 900 people die of anal cancer annually. [39]
While breast cancer is still most common in middle-aged and older women, according to the American Cancer Society, recent research shows that rates have increased in younger women over the past ...