Before the unveiling: What you need to know about black holes

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After about two years of "printing," the mysterious black hole will finally show its face to human beings.

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Before the grand unveiling, here are some basics you need to know about black holes:

Speculations over black holes have been around for ages. Studies and researches about these mysterious objects are everywhere on the Internet.

Before scientists unveil the mask of the first ever image today, let's check out what we've got so far.

CGTN will broadcast the Shanghai event live at 20:40 BJT, please stay tuned.

(Cover via VCG; top video by Anosi Wang; CGTN's Pan Zhaoyi also contributed to this story.)