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...。As every day of Donald Trump's presidential campaign seemingly generates new headlines, this two-hour special examines the increasingly polarizing candidate's past. Included is rarely seen footage from Trump's interviews with Phil Donahue and his comments about politics from the floor of the 1988 Republican convention. Additionally, celebrities, politicians, and people describe...。