Tyson then describes the nature of black holes, their enormous gravitational forces that can even capture light, and their discovery via X-ray sources such as Cygnus X-1.
Tyson lalu menjelaskan sifat lubang hitam, gaya gravitasinya yang besar sehingga mampu membelokkan cahaya, dan penemuan lubang hitam menggunakan sumber-sumber sinar-X seperti Cygnus X-1.