शैडोइंग अभ्यास: How One of the Universe’s Biggest Secrets Was Discovered - YouTube के साथ अंग्रेजी बोलना सीखें

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- In the early hours of Sunday, September 14th, 2015, a scientist in Louisiana makes a fateful decision.

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- In the early hours of Sunday, September 14th, 2015, a scientist in Louisiana makes a fateful decision.

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- Robert Schofield has been working all weekend doing final calibrations.

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- All righty, let's take a spectrum.

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- He has one last test, - So let's see where this computer's getting its power.

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- But it's late, and the equipment is not cooperating.

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- It was about four or so in the morning, and we still had about another hour of work to do.

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And we were like, "Yeah, things aren't working so well and I'm really tired.

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Let's not do this last hour or so of work." - They call it a night.

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And 40 minutes later, in the silence of their inactivity, they open the door to history.

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A powerful gravitational wave rumbles through both detectors, Louisiana and Washington.

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Had Robert Schofield worked 40 more minutes that night with the instruments in test mode, a signal that had been on its way for 1.3 billion years would never have been recorded.

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- I like to say, you know, one of my biggest contributions to LIGO has been my laziness that day.

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- I got an email from somebody here saying, "Hey, look at this place on the web." I looked at that and I said, "Holy (beep)." - It was so strong that you could see it by eye in the data.

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It was too good to be true.

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- But it was true.

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In fact, it was loud and surprisingly clear.

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- And it just sang at you.

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Just there it was, standing out.

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- The signal lasted less than a second.

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But in that briefest of moments, it delivered a cosmically profound message more than a billion years in the making, proving the existence of black holes.

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- So what we saw in the signal involved oscillations of the mirrors that were slow at first, became faster and faster and faster.

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And this was precisely the kind of behavior that you would expect from gravitational waves caused by two black holes going around each other, spiraling together.

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- Two massive black holes, one 29 times the mass of the Sun, the other 36 times the mass of the Sun, whipping around each other hundreds of times a second, finally completing their act of mutual destruction by merging, creating a single larger black hole of 62 solar masses.

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The violent merger converts some of the mass into an apocalyptic release of energy beyond anything ever before witnessed.

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- The collision, in effect, creates a veritable storm in the fabric or the shape of space and time.

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As though you had taken three suns, you had annihilated them completely, converted it in to gravitational waves.

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The power was 50 times higher than the output power of all the stars in the universe put together, in a fraction of a second.

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But the most powerful explosion that humans have ever had any evidence for, with the exception of the Big Bang.

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- Since that very first signal in September, 2015, LIGO has detected several more collisions of black holes.

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In October, 2017, Ray Weiss, Kip Thorne, and LIGO's former director, Barry Barish, received the Nobel Prize.

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The LIGO discoveries proved that black holes can merge, one way they can grow bigger quickly.

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- More and more evidence of these merging black holes tells us there are a lot of these stellar black holes around that they can find each other and merge.

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- And the discovery opened an entirely new way of observing the universe.

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- We always thought of astronomy as an observational field where we are looking at radiation, we are seeing things.

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But this is not radiation, this is something much more fundamental.

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These are sort of fundamental tremors in space time itself.

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We can now hear the universe.

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- For the first time, astronomers have simultaneously seen and heard a cosmic event.

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In August, 2017, LIGO detected gravitational waves from a collision of two neutron stars.

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Black holes are empty space, but neutron stars are dense dead stars that can crash together and light up the skies.

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When telescopes and satellites around the globe pointed in the direction of the sound, the world saw fireworks in an explosive collision and afterglow.

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Possibly the collision resulted in the creation of a new black hole.

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But unless we observe the formation of a black hole, there is much we will never know.

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Because so much about black holes is irretrievably out of our reach, we can never know where they came from, what's inside, or their history.

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But we can imagine their future.

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The number of black holes in the universe is increasing, and they're getting bigger.

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Stars collapse, black holes feed and merge, new ones form.

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Could it be that one day everything will end up inside them and they will rule the universe?

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Untold trillions upon trillions of years after this happens and the last bits of matter cross their event horizons, black holes themselves may radiate away and vanish from this reality.

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Their mysteries are many, and we're just starting to unlock the secrets of these strange, powerful places.

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But one thing is certain, black holes will continue to intrigue us, tantalize us, and challenge both our science and our imaginations.

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शैडोइंग अभ्यास: How One of the Universe’s Biggest Secrets Was Discovered - YouTube के साथ अंग्रेजी बोलना सीखें

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