• The Giant, Amazing Machines NASA Built for the Shuttle
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    The Giant, Amazing Machines NASA Built for the Shuttle

    [ ♪ Intro ] The Space Shuttle may have been out of commission for nearly a decade now. But it’s still arguably one of humanity’s greatest achievements. Unlike the rockets and capsules we use today, the shuttle was ideal for short trips to space. You could launch into orbit, stay there for a couple of weeks to do what you needed to do, then come home and touch down on a runway like it was just another transatlantic flight. Thanks to the shuttle, we were able to repair the Hubble Space Telescope multiple times and build the International Space Station. Exploration today would be vastly different without it. But no…

  • How to take a picture of a black hole | Katie Bouman
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    How to take a picture of a black hole | Katie Bouman

    In the movie “Interstellar,” we get an up-close look at a supermassive black hole. Set against a backdrop of bright gas, the black hole’s massive gravitational pull bends light into a ring. However, this isn’t a real photograph, but a computer graphic rendering — an artistic interpretation of what a black hole might look like. A hundred years ago, Albert Einstein first published his theory of general relativity. In the years since then, scientists have provided a lot of evidence in support of it. But one thing predicted from this theory, black holes, still have not been directly observed. Although we have some idea as to what a black hole…

  • The Largest Black Holes in the Universe
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    The Largest Black Holes in the Universe

    We’ve never seen them directly, yet we know they are there, lurking within dense star clusters or wandering the dust lanes of the galaxy, where they prey on stars or swallow planets whole. Our Milky Way may harbor millions of black holes, the ultra dense remnants of dead stars. But now, in the universe far beyond our galaxy, there’s evidence of something far more ominous, a breed of black holes that has reached incomprehensible size and destructive power. Just how large, and violent, and strange can they get? A new era in astronomy has revealed a universe long hidden to us. High-tech instruments sent into space have been tuned to…

  • ★ How to Get to Mars. Very Cool! HD
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    ★ How to Get to Mars. Very Cool! HD

    We don’t fire a rocket motor all the way to mars. We don’t need to You just place the spacecraft on a trajectory to mars and let it coast for seven months and 300 million miles until it reaches the planet Atmospheric entry in 3.. 2.. 1.. Just passed in one minute that atmospheric entry current altitude 121 miles, current velocity 12,084 miles per hour We are now at an altitude of 73 miles moving at a speed of 12,192 miles per hour expected parachute deploy in five seconds four three, two, one, Mark We’re awaiting confirmation parachute has deployed Parachute was detected Heat shield deployed event Spacecraft reporting the…

  • Where are all the aliens? | Stephen Webb
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    Where are all the aliens? | Stephen Webb

    I saw a UFO once. I was eight or nine, playing in the street with a friend who was a couple of years older, and we saw a featureless silver disc hovering over the houses. We watched it for a few seconds, and then it shot away incredibly quickly. Even as a kid, I got angry it was ignoring the laws of physics. We ran inside to tell the grown-ups, and they were skeptical — you’d be skeptical too, right? I got my own back a few years later: one of those grown-ups told me, “Last night I saw a flying saucer. I was coming out of the pub after…