动画: 黑洞摧毁恒星

动画: 黑洞摧毁恒星

Animation: Black Hole Destroys Star
Video Illustration Credit: DESY, Science Communication Lab

Explanation: What happens if a star gets too close to a black hole? The black hole can rip it apart — but how? It’s not the high gravitational attraction itself that’s the problem — it’s the difference in gravitational pull across the star that creates the destruction. In the featured animated video illustrating this disintegration, you first see a star approaching the black hole. Increasing in orbital speed, the star’s outer atmosphere is ripped away during closest approach. Much of the star’s atmosphere disperses into deep space, but some continues to orbit the black hole and forms an accretion disk. The animation then takes you into the accretion disk while looking toward the black hole. Including the strange visual effects of gravitational lensing, you can even see the far side of the disk. Finally, you look along one of the jets being expelled along the spin axis. Theoretical models indicate that these jets not only expel energetic gas, but also create energetic neutrinos — one of which may have been seen recently on Earth.

Almost Hyperspace: Random APOD Generator

Tomorrow’s picture: big squid

动画: 黑洞摧毁恒星
示意影片提供: DESY, Science Communication Lab

说明: 恒星太靠近黑洞会怎样？黑洞会把恒星撕碎。然而，过程何似？关键并非重力有多强，而是恒星各区域感受到的引力差（引潮力），才是恒星毁灭的主因。这部主题动画揭示了恒星粉身碎骨的过程。在动画开头之时，可见到一颗往黑洞靠近的恒星。在它的轨道速率增加的同时，恒星的外层大气在最近距时被剥去。大部分的恒星大气最后会消散在太空中，只有部分会持续旋绕黑洞形成吸积盘。接着，动画带我们进入吸积盘，并眺望中央的黑洞。除了见到引力透镜所造成的奇特视觉效应之外，甚至还可见到吸积盘的反侧。最后，我们的视线沿着二道顺着自转轴外泛的喷流之一观看。理论模型指出，这些喷流里不但有高速流动的气体，也有高能微中子，而且地球上的观测在不久前刚找到一个实例。

几乎超空间: 随机APOD生成器

明日的图片: big squid

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