Wszechświat Odcinek 5: Before The Big Bang: Before The Dawn

Professor Brian Cox continues his epic exploration of the universe with a journey into darkness. The centre of our galaxy is home to an invisible monster of unimaginable power - a supermassive black hole named Sagittarius A*. Weighing 4 million times the mass of the Sun, it's an object with such an immense gravitational field that nothing can escape - not even light.