Shock waves rip through the less dense regions around the stars, heating the gas and forming the delicate shells we see today.
强大的波浪会闯进那些气体密度较低的环绕在星星周围的地区,将那些气体加热然后转换成为我们现在看到的精美的壳体。
Holmberg II is a patchwork of dense star-forming regions and extensive barren areas with less material, which can stretch across thousands of light-years – so, gravitationally speaking, it’s a gentle haven where fragile structures such as these bubbles can hold their shape.
霍姆伯格星系是由一个高密度星系的拼凑出来的,可以延伸几千光年,所以从重力学角度讲,这是一个适合那些易碎的星体保持形状的地方。
But what earned Holmberg II its place in Halton Arp’s Atlas is what you can’t see in this image: the ultraluminous X-ray source in the middle of three gas bubbles in the top right of the image.
但是霍姆伯格星系并不是你看到的这样。在图片右上角的三个气体泡泡的中心部位,有大量的X射线的存在。
There are competing theories as to what causes this powerful radiation — one intriguing possibility is an intermediate-mass black hole which is pulling in material from its surroundings.
关于是什么引起了这种强有力的辐射,还有其他的很多理论。有一种是说在这附近有一个巨大的黑洞,以至于吸引周围的很多物体。
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