BBC Light and Dark 2013 COMPLETE PDTV x264 AAC-MVGroup

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BBC - Light and Dark (2013) COMPLETE PDTV x264 AAC-MVGroup
English | 2x~59mmin | H264 | 832x468 | 25.00fps 1593 Kbps | AAC 128 Kbps 48.0khz | 1.26 GiB
Genre: Documentary

Professor Jim Al-Khalili shows how scientists have used light to reveal almost everything we know about the universe.

Part 1: Light
The story begins in the 3rd century BC when, by trying to understand the tricks of perspective, the Greek mathematician Euclid discovered that light travels in straight lines, which meant that if we could change its path we could change how we see the world. In Renaissance Italy 2,000 years later, Galileo Galilei did just that by using the lenses of his simple telescope to reveal our true place in the cosmos. In the 1670s, the Danish astronomer Ole Roemer discovered that light travelled at a finite speed, a discovery that had a profound implication. It meant the further one looks out into the universe, the further one looks back in time. And in 1964, by detecting the cosmic microwave background, the afterglow of the big bang, we captured the oldest light in the universe and saw as far back as its possible to see with light.

Part 2: Dark
Professor Jim Al-Khalili tells the story of how we went from thinking we were close to a complete understanding of the universe to realising we had seen almost none of it. Today, our best estimate is that more than 99 per cent of the cosmos is hidden in the dark, invisible to our telescopes and beyond our comprehension. The first hints that there might be more out there than meets the eye emerged from the gloom in 1846 with the discovery of the planet Neptune. It was hard to find, because there was precious little light to illuminate it. In the middle of the 20th century scientists discovered dark matter - stuff that wasn't just unseen, it was fundamentally un-seeable. In the late 1990s scientists trying to measure precisely how much dark matter there was in the universe discovered something even more elusive out there - dark energy, a mysterious new force driving the universe apart that is thought to make up a colossal 73 per cent of it.

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