Mysterious Universe - NOVA Documentary HD (2019)

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Mysterious Universe - NOVA Documentary HD (2019) 4
For the first time, astronomers have used supermassive black holes from just after the Big Bang to measure the expansion rate of the Universe. Now, we have a bigger mystery on our hands than the answer this effort provided.


It turns out the Universe is growing faster than expected. This could mean that the dark energy thought to drive the acceleration of this expansion, also sometimes interpreted as the cosmological constant described by Albert Einstein, is not so cosmologically constant after all.

Instead, it could be growing stronger.

The Universe's rate of expansion is called the Hubble Constant, and it's been incredibly tricky to pin down. Every test seems to come up with a different result; recently, data from the Planck satellite that measured the cosmic microwave background set it at 67.4 kilometers (41.9 miles) per second per megaparsec, with less than 1 percent uncertainty.

Other methods typically involve the use of 'standard candles', objects with known luminosity such as cepheid variable stars or Type Ia supernovae, from which distance can be calculated based on their absolute magnitude.

Last year a cepheid variable star calculation of the Hubble Constant returned a result of 73.5 kilometers (45.6 miles) per second per megaparsec. So you can see why astronomers keep poking this weird cosmic bear.

But a few years ago, astronomers realized that the distance to another object could be calculated accurately, too. Enter quasars, along with their black holes.


Quasars are among the brightest objects in the Universe. Each is a galaxy that orbits a supermassive black hole actively feeding on a material. Its light and radio emissions are caused by material around the black hole, called an accretion disc, which emits intense light and heat from friction as it swirls like water circling a drain.

They also emit X-ray and ultraviolet light; and, as discovered by astronomers Guido Risaliti of Università di Firenze, Italy, and Elisabeta Lusso of Durham University, UK, the ratio of these two wavelengths produced by a quasar varies depending on the ultraviolet luminosity.

Once this luminosity is known, as calculated from that ratio, the quasar can be used just like any other standard candle.

And that means we can measure farther back into the Universe's history.

"Using quasars as standard candles have great potential, since we can observe them out too much greater distances from us than Type Ia supernovae, and so use them to probe much earlier epochs in the history of the cosmos," Lusso said.

The researchers compiled UV data on 1,598 quasars from just 1.1 billion to 2.3 billion years after the Big Bang and used their distances to calculate the expansion rate of the early Universe.

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💬 Comments on the video
Author

Great video and some many Great peoples. Thank you You-tube for making this kind of programme available to mankind. So many things we don't know.

Author — David tiah

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my dad said im here because of the big bang on their wedding night

Author — rob wells

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When Neil DeGrasse Tyson starts talking, he sounds like someone in a crime show who is having their voice distorted to hide their identity.

Author — Matthew Fodell

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It's a micro world after all come in sing it!

Author — Jerry Blanton

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This video is a mess - clips mixed up, some repeated.

Author — Paul Ford

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Interesting congratulations facts ABOUT. mrNelson1963

Author — nelson lariccia

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Newton: If an apple falls, does the moon also fall? I will invent the Calculus and become the father of physics. IQ =180

Author — Oscar Banuelos

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Newgrange, Co. Meath, Ireland is 5, 000 years old.

Author — Eamonn Tutty

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This is the most jumbled-up, haphazard video ever. It presents a couple of segments more than once and many parts are out of order.

Author — Gray Matters

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I'm high but what if we got the lowest iq in the universe and aliens don't care about us and what if we are the aliens

Author — imstupid4life

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This program actually ends at 1:10:00 like Anish Saud observed. After that, it starts all over again from the beginning and repeats what we have already heard.

Author — Peter Smitt

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How the hell can you keep track of the show when it's bouncing around from topic to topic??? I'm out

Author — Jeff Chard

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These brains from early days till now worked so hard to understand and have a today knowledge. And after all of these some on come and says THE EARTH IS FLAT .🤣

Author — mhamad abdul

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You are stuck here the same as the rest of us

Author — Tina Bates

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Excellent video👌🏻 keep up the great work 👍🏻👍🏻😎

Author — DOG w

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So what banged? Why did it bang? Given that Universe is exoanding, and expansion is accelerating. That means that cosmological constant also changes. Which means that laws Of Physics, including Relativity and Special Relativity also change. Thus the Laws of our existence hold true for our slice of space-time, that we inhabit.

Author — Dmitri Kozlowsky

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Mysteious Universe - NOVA Documentary HD ( 2019 )
22. 07. july. manday. 2019.a. *

Author — Tarmo valk

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I think a Big bang is a black hole in another universe opening up. And expelling its content into a new one. Just a uneducated guess.

Author — Ronan Barthon

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good video I loved science since I was a kid but my love for god cannot be or will not be domained by any other love this will not be changed!!!! AMEN

Author — Rinoa joyce san juan

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A very very nice documentary, if further combined with the cosmic background radiation this would be the story so far

Author — David Solomon