视频简介
Black holes stand at the limit of what we can know. To explore that edge of knowledge, the Event Horizon Telescope links observatories across the world to simulate an earth-sized instrument. With this tool the team pursues the first-ever picture of a black hole, resulting in an image seen by billions of people in April 2019. Meanwhile, Hawking and his team attack the black hole...。The Yangtze River Bridge in Nanjing is one of the most famous bridges in China. It is also the most popular place in the world to commit suicide. For the past 11 years Chen Si has been patrolling this bridge, looking to provide aid for those who've gone there to end their lives. Incredibly, he has saved over 300 people since he began - nearly one every two weeks. 南京长江大桥是中国最著名的桥...。