Hubble telescope catches stunning picture of the Bubble Nebula

 作者:南门绘岈     |      日期:2019-03-15 02:13:00
NASA, ESA, Hubble Heritage Team By Jacob Aron You really would be forever blowing bubbles if you wanted one this big. To celebrate the Hubble Space Telescope being in orbit for 26 years – the anniversary is on Sunday – astronomers have used it to capture this majestic view of the Bubble Nebula. The giant bubble, also known as NGC 7635, is a cloud of gas and dust 10 light years across, located in the constellation Cassiopeia. It was discovered by William Herschel in 1787 and has been partially photographed by Hubble before, but this is the first time the telescope has captured its full glory in a single image. Inside the bubble sits SAO 20575, a star between 10 and 20 times the mass of the sun. Gas from the star – its stellar wind – provides the pressure to inflate the surrounding interstellar material into a bubble shape. But we don’t know why the bubble is perfectly spherical even though the star isn’t at its centre. More on these topics: