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Cygnus X-1 in 60 sec.jpg

Cygnus X-1 Black Hole

This is candidate black hole Cygnus X-1. A photo was issued by NASA.

​이 사진은 미우주항공국 NASA에서 찍은 블랙홀 후보인 백조좌의 X-1입니다.

History

역사란 무엇인가?

What's the history?

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