What is a black hole? A black hole is an astronomical object with a gravitational pull so strong that nothing, not even light, can escape it. A black hole’s “surface,” called its event horizon, defines the boundary where the velocity needed to escape exceeds the speed of light, which is the speed limit of the cosmos. Matter and radiation fall in, but they can’t get out.

Two main classes of black holes have been extensively observed. Stellar-mass black holes with three to dozens of times the Sun’s mass are spread throughout our Milky Way galaxy, while supermassive monsters weighing 100,000 to billions of solar masses are found in the centers of most big galaxies, ours included.

This image is an artist’s concept of a tidal disruption event that happens when a star passes fatally close to a supermassive black hole, which reacts by launching a relativistic jet.

What is a black hole? Learn more.

Image Credit: Sophia Dagnello, NRAO/AUI/NSF

什么是黑洞？黑洞是一個具有強大引力的天文物體，任何物體，甚至光，都無法逃脫它。黑洞的“表面”，稱為視界，定義了逃逸速度超過光速的邊界，光速是宇宙的速度極限。物質和輻射進入，但它們出不去。

人們已經廣泛地觀察到了兩類主要的黑洞。質量為太陽三到幾十倍的恒星質量黑洞遍布我們的銀河系，而在大多數大星系(包括我們的星系)的中心發現了質量為太陽10萬到10億倍的超大質量黑洞。

這幅圖片是一個藝術家對潮汐中斷事件的概念，當一顆恒星致命地靠近一個超大質量黑洞時，這個黑洞會通過發射相對論性噴流做出反應。

什么是黑洞？了解更多。

圖片來源：Sophia Dagnello，NRAO/AUI/NSF

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