韦伯和哈勃拍摄的环状星云
(原标题: The Ring Nebula from Webb and Hubble)
2023-08-14
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环状星云（M57），比通过小型望远镜看到的要复杂得多。很容易看到的中心环直径约为一光年，但这张由詹姆斯·韦伯太空望远镜和哈勃太空望远镜联合拍摄的引人注目的照片，在可见光和红外光的深度曝光下，探索了这个受欢迎的星云。在这张指定颜色的数字增强特征图像中，像宇宙眼睛周围的睫毛一样的气体串在环周围变得明显。这些长细丝可能是由环内发射的高能光对致密气体结的阴影造成的。环状星云是一个细长的行星状星云，是一种气体云，当一颗类似太阳的恒星进化出外层大气，成为一颗白矮星时形成的。环状星云的中心椭圆形位于音乐星座天琴座约2500光年远的地方。
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The Ring Nebula (M57), is more complicated than it appears through a small telescope. The easily visible central ring is about one light-year across, but this remarkable combined exposure by the James Webb Space Telescope and the Hubble Space Telescope explores this popular nebula with deep exposures in visible and infrared light. Strings of gas, like eyelashes around a cosmic eye, become evident around the Ring in this digitally enhanced featured image in assigned colors. These long filaments may be caused by shadowing of knots of dense gas in the ring from energetic light emitted within. The Ring Nebula is an elongated planetary nebula, a type of gas cloud created when a Sun-like star evolves to throw off its outer atmosphere to become a white dwarf star. The central oval in the Ring Nebula lies about 2,500 light-years away toward the musical constellation Lyra.