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Nikolai Vavilov risked his life for a discovery that would change the history of science.
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For the first time, scientists have captured a photograph of a black hole. The image verifies one of the most important theories in physics and will help unlock the greatest mysteries of the cosmos.
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From the furthest reaches of space to our own cosmic backyard, we count down the discoveries that changed everything we know about our universe.
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Horizon goes behind the scenes at NASA as they countdown to the landing of a 2.5 billion-dollar rover on the surface of Mars. In six days time, the nuclear-powered vehicle - the size of a car - will be winched down onto the surface of the Red Planet from a rocket-powered crane. That's if things go according to plan: Mars has become known as the Bermuda Triangle of space because so many missions there have ended in failure. The Curiosity mission is the most audacious - and expensive - attempt to answer the question: is there life on Mars?
Scientists using the Hubble Telescope study vivid images from 12 billion and more light years away and observe that many galaxies cluster together like -- soap bubbles! Analyzing factors like dark matter and gravitational lensing, how can astronomers confirm this amazing bubble structure?
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