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"Most massive galaxies, including our own Milky Way, are thought to harbour supermassive black holes at their centres. But these newly discovered black holes are much bigger than would be predicted by extrapolating from observations from their host galaxies. This suggests that the factors influencing the growth of the largest galaxies and their black holes differ from those influencing smaller galaxies. The findings come from observations of two nearby galaxies: NGC 3842 and NGC 4889."

"Astronomers have spied a star's swan song as it is shredded by a black hole. Researchers suspect that the star wandered too close to the black hole and got sucked in by the huge gravitational forces. The star's final moments sent a flash of radiation hurtling towards Earth. "

"The stereo movie has been adapted to human binocular vision. The movie does not represent what you would actually see with your two eyes if you visited a real black hole. In reality, the curved spacetime would distort wavefronts of light away from spherical, confusing your binocular perception. The conflicting visual cues might make you feel queasy. But the failure of binocular vision is merely a limitation of beings who have evolved in flat spacetime. Trinocular vision would work fine."

The Stages of collapse of a star, neutron star formation and black hole formation.

Bill Nye and the Discovery Channel give you the greatest discoveries in science. In this episode, Nye covers Einstein's theory of general relativity, demonstrates how Hubble determined that the universe is expanding, and discusses the 20th-century advancements that help us understand gamma ray bursts, black holes, pulsars, and quasars. Highlights include Edmond Halley, whose discovery of comets orbiting the sun proved that gravity works in space, and Alexander and Caroline Herschel, whose map of the sky brought new understanding of the universe.