美国国家航空航天局NASA每日一图(天文)-2017年7月20日

2017 July 20

IC 1396: Emission Nebula in Cepheus
Image Credit & Copyright: César Blanco González
Explanation: Stunning emission nebula IC 1396 mixes glowing cosmic gas and dark dust clouds in the high and far off constellation of Cepheus. Energized by the bright central star seen here, this star forming region sprawls across hundreds of light-years, spanning over three degrees on the sky while nearly 3,000 light-years from planet Earth. Among the intriguing dark shapes within IC 1396, the winding Elephant's Trunk nebula lies just below center. Stars could still be forming inside the dark shapes by gravitational collapse. But as the denser clouds are eroded away by powerful stellar winds and radiation, any forming stars will ultimately be cutoff from the reservoir of star stuff. The gorgeous color view is a composition of image data from narrowband filters, mapping emission from the nebula's atomic oxygen, hydrogen, and sulfur into blue, green, and red hues.

 

2017年7月20日

IC 1396:Cepheus的排放星云
图像信用和 版权: CésarBlancoGonzález
说明: 令人惊叹的发射星云 IC 1396 在Cepheus 高高远的星座中混合发光的宇宙气体和暗灰尘云 。这颗明星形成的区域由这颗明亮的中央星星所激发, 遍布数百个光年,跨度超过三度,距地球近3000光年。在IC 1396中有趣的 黑暗形状中,绕着 大象的中继 星云位于中心之下。星星仍然可以通过引力崩溃形成黑暗的形状。但是,随着密集的云层被强大的恒星风和辐射侵蚀,任何形成的星星将最终都将从明星的水库中截取。

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