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How the Universe Works - Mysteries Of Our Place In The Milky Way- Space Discovery Documentary

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How the Universe Works - Mysteries Of Our Place In The Milky Way- Space Discovery Documentary

How the Universe Works - Mysteries Of Our Place In The Milky Way- Space Discovery Documentary

Supermassive black holes: Most Powerful Objects in the Universe - Space Discovery Documentary

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A supermassive black hole (SMBH or sometimes SBH) is the largest type of black hole, containing a mass of the order of hundreds of thousands, to billions of times, the mass of the Sun (M☉). Black holes are a class of astronomical object that have undergone gravitational collapse, leaving behind spheroidal regions of space from which nothing can escape, not even light. Observational evidence indicates that nearly all large galaxies contain a supermassive black hole, located at the galaxy's center. In the case of the Milky Way, the supermassive black hole corresponds to the location of Sagittarius A* at the Galactic Core. Accretion of interstellar gas onto supermassive black holes is the process responsible for powering quasars and other types of active galactic nuclei.
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How the Universe Works - Death of the Milky Way - Space Discovery Documentary

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Academics at Tohoku University believe the Milky Way experienced a dark age when the formation of new stars dramatically stopped. But this grim era may have sparked a process which led to the galaxy’s glorious Second Coming and take the form which allowed intelligent life to spring up on one of its spinning arms.
‘The Milky Way galaxy has died once before and we are now in what is considered its second life,’ the university announced in a statement. ‘Stars formed in two different epochs through different mechanisms. ‘There was a long dormant period between when star formation ceased. Our home galaxy has turned out to have a more dramatic history than was originally thought.’ A scientist called Masafumi Noguchi calculated the evolution of the Milky Way over the past 10 billion years.

How the Universe Works - National Geographic The Universe - Space Discovery Documentary

How many planets are in the solar system? How did it form in the Milky Way galaxy? Learn facts about the solar system’s genesis, plus its planets, moons, and asteroids.
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How the Universe Works - MYSTERY OF SPACE-TIME - Space Discovery Documentary

A black hole is a mathematically defined region of spacetime exhibiting such a strong gravitational pull that no particle or electromagnetic radiation can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of the region from which no escape is possible is called the event horizon. Although crossing the event horizon has enormous effect on the fate of the object crossing it, it appears to have no locally detectable features. In many ways a black hole acts like an ideal black body, as it reflects no light. Moreover, quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is on the order of billionths of a kelvin for black holes of stellar mass, making it essentially impossible to observe. Objects whose gravitational fields are too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace. The first modern solution of general relativity that would characterize a black hole was found by Karl Schwarzschild in 1916, although its interpretation as a region of space from which nothing can escape was first published by David Finkelstein in 1958. Long considered a mathematical curiosity, it was during the 1960s that theoretical work showed black holes were a generic prediction of general relativity. The discovery of neutron stars sparked interest in gravitationally collapsed compact objects as a possible astrophysical reality.Black holes of stellar mass are expected to form when very massive stars collapse at the end of their life cycle. After a black hole has formed, it can continue to grow by absorbing mass from its surroundings. By absorbing other stars and merging with other black holes, supermassive black holes of millions of solar masses (M☉) may form. There is general consensus that supermassive black holes exist in the centers of most galaxies.Despite its invisible interior, the presence of a black hole can be inferred through its interaction with other matter and with electromagnetic radiation such as visible light. Matter falling to determine its mass and location. Such observations can be used to exclude possible alternatives (such as neutron stars). In this way, astronomers have identified numerous stellar black hole candidates in binary systems, and established that the radio source known as Sgr A*, at the core of our own Milky Way galaxy, contains a supermassive black hole of about 4.3 million M☉.
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How the Universe Works - Mysteries Of Our Place In The Milky Way- Space Discovery Document

How the Universe Works - Mysteries Of Our Place In The Milky Way- Space Discovery Documentary Thanks for ing Please Like, Share, Comment and
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How the Universe Works - The Mystery of Space-Time - Space Discovery Documentary

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In physics, spacetime is any mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum. Spacetime diagrams can be used to visualize relativistic effects such as why different observers perceive where and when events occur differently.

Until the turn of the 20th century, the assumption had been that the three-dimensional geometry of the universe (its spatial expression in terms of coordinates, distances, and directions) was independent of one-dimensional time. However, in 1905, Albert Einstein based his seminal work on special relativity on two postulates: (1) The laws of physics are invariant (i.e., identical) in all inertial systems (i.e., non-accelerating frames of reference); (2) The speed of light in a vacuum is the same for all observers, regardless of the motion of the light source.

The logical consequence of taking these postulates together is the inseparable joining together of the four dimensions, hitherto assumed as independent, of space and time. Many counterintuitive consequences emerge: in addition to being independent of the motion of the light source, the speed of light has the same speed regardless of the frame of reference in which it is measured; the distances and even temporal ordering of pairs of events change when measured in different inertial frames of reference (this is the relativity of simultaneity); and the linear additivity of velocities no longer holds true.

How the Universe Works - Blow your Mind of the Universe Part 1 - Space Discovery Documentary

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How the Universe works - Strangest Things Found in Deep Space Exploration (Full Documentary Films)

The Journey to the Edge of the Universe documentary film broadcast on National Geographic and Discovery Channels. It documents a space journey from ...

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Humanity is at a crossroads! on this 2015 documentary we will try to predict what will happened in the future: Nearly half of the Amazon rainforest has been ...

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How the Universe works - Strangest Things Found in Deep Space Exploration (Full Documentary Films)

How the Universe works - Strangest Things Found in Deep Space Exploration (Full Documentary Films)

Mysteries of the Universe - The First Moment Of Time - Space Discovery Documentary

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In popular parlance the big bang has two meanings. First, big bang cosmology is the hypothesis that our universe has been expanding for 13.7 billion years from an extremely hot and dense primordial state-more extreme than the centre of a star or indeed anywhere now existing. This I have no quarrel with-it is established scientific fact which has been elaborated into a detailed story which narrates the expansion of the universe from an extremely uniform and dense hot plasma to the beautifully varied and complex world that is our home. We have detailed theories which pass numerous observational tests which explain the origins of all the structures we see from the elements to galaxies, stars, planets and the molecular building blocks of life itself. As in any good scientific theory there are questions still to be answered, such as the precise nature of the dark matter and dark energy which are prominent actors in the story, or the very interesting question of whether there was a very early phase of inflationary exponential expansion, but these do not suggest the basic picture could be wrong.
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How the Universe Works Extreme Stars

Discussion of stars and how they form, live, and die

Earth and the Milky Way - Discover the mystery - Space Documentary 2017

Earth and the Milky Way - Discover the mystery - Space Documentary 2017
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Structure of the Milky Way:
If you could travel outside the galaxy and look down on it from above, you’d see that the Milky Way is a barred spiral galaxy. For the longest time, the Milky Way was thought to have 4 spiral arms, but newer surveys have determined that it actually seems to just have two spiral arms, called Scutum–Centaurus and Carina–Sagittarius.
The spiral arms are formed from density waves that orbit around the Milky Way – i.e. stars and clouds of gas clustered together. As these density waves move through an area, they compress the gas and dust, leading to a period of active star formation for the region. However, the existence of these arms has been determined from observing parts of the Milky Way – as well as other galaxies in our universe.
The Solar System:
The Solar System (and Earth) is located about 25,000 light-years to the galactic center and 25,000 light-years away from the rim. So basically, if you were to think of the Milky Way as a big record, we would be the spot that’s roughly halfway between the center and the edge.
Astronomers have agreed that the Milky Way probably has two major spiral arms – Perseus arm and the Scutum-Centaurus arm – with several smaller arms and spurs. The Solar System is located in a region in between the two arms called the Orion-Cygnus arm. This arm measures 3,500 light-years across and is 10,000 light-years in length, where it breaks off from the Sagittarius Arm.
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How the Universe Works - From The Big Bang To The Present Day - Space Discovery Documentary

How the Universe Works - From The Big Bang To The Present Day - Space Discovery Documentary
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How the Universe Works - Secret History of Mercury - Space Discovery Documentary

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The Mercury Atmosphere and Surface Composition Spectrometer (MASCS) instrument aboard NASA's MESSENGER spacecraft was designed to study both the exosphere and surface of the planet Mercury. To learn more about the minerals and surface processes on Mercury, the Visual and Infrared Spectrometer (VIRS) portion of MASCS has been diligently collecting single tracks of spectral surface measurements since MESSENGER entered Mercury orbit on March 17, 2011. The track coverage is now extensive enough that the spectral properties of both broad terrains and small, distinct features such as pyroclastic vents and fresh craters can be studied. To accentuate the geological context of the spectral measurements, the MASCS data have been overlain on the monochrome mosiac from the Mercury Dual Imaging System (MDIS), an instrument with wide- and narrow-angle cameras to map the rugged landforms and spectral variations on Mercury’s surface. Click on the image to explore the colorful diversity of surface materials in more detail!

The MESSENGER spacecraft is the first ever to orbit the planet Mercury, and the spacecraft's seven scientific instruments and radio science investigation are unraveling the history and evolution of the solar system's innermost planet. In the mission's more than four years of orbital operations, MESSENGER has acquired over 250,000 images and extensive other data sets. MESSENGER's highly successful orbital mission is about to come to an end, as the spacecraft runs out of propellant and the force of solar gravity causes it to impact the surface of Mercury near the end of April 2015.

The Mystery of the Milkyway[Space Documentary]HD

The Mystery of the Milky Way: How telescopes have expanded our view of the universe.In this two-hour special, NOVA examines how a simple instrument, the telescope, has fundamentally changed our understanding of our place in the universe. What began as a curiosity—two spectacle lenses held a foot apart—ultimately revolutionized human thought across science, philosophy, and religion. Hunting the Edge of Space takes viewers on a global adventure of discovery, dramatizing the innovations in technology and the achievements in science that have marked the rich history of the telescope.

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Voyager`s Interstellar Mission:

If the Earth Stops Spinning:

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Discovering the Secrets of the Sun & Mysteries Of Our Place In The Milky Way - Space Documentary

Traces of an enormous solar storm that battered the atmosphere and showered Earth in radioactive particles more than 2,500 years ago have been discovered under the Greenland ice sheet.Scientists studying ice nearly half a kilometre beneath the surface found a band of radioactive elements unleashed by a storm that struck the planet in 660BC.It was at least 10 times more powerful than any recorded by instruments set up to detect such events in the past 70 years, and as strong as the most intense known solar storm, which hit Earth in AD775.Raimund Muscheler, a professor of quaternary sciences at Lund University in Sweden, said: “What our research shows is that the observational record over the past 70 years does not give us a complete picture of what the sun can do.” The discovery means that the worst-case scenarios used in risk planning for serious space weather events underestimate how powerful solar storms can be, he said. Solar storms are whipped up by intense magnetic fields on the surface of the sun. When they are pointed toward Earth they can send highly energetic streams of protons crashing into the atmosphere. The sudden rush of particles can pose a radiation risk to astronauts and airline passengers, and can damage satellites, power grids and other electrical devices. Scientists have come to realise over the past decade that intense solar storms can leave distinct traces when they crash into the planet. When high energy particles slam into the stratosphere, they collide with atomic nuclei to create radioactive isotopes of elements such as carbon, beryllium and chlorine. These can linger in the atmosphere for a year or two, but when they reach the ground they can show up in tree rings and ice cores used to study the ancient climate. Muscheler’s team analysed two ice cores drilled from the Greenland ice sheet and found that both contained spikes in isotopes of beryllium and chlorine that date back to about 660BC. The material appears to be the radioactive remnants of a solar storm that battered the atmosphere. The scientists calculate that the storm sent at least 10bn protons per square centimetre into the atmosphere. “A solar proton event of such magnitude occurring in modern times could result in severe disruption of satellite-based technologies, high frequency radio communication and space-based navigation systems,” they write in Proceedings of the National Academy of Sciences. Britain’s emergency plans for severe space weather are based on a worst-case scenario that involves a repeat of the 1859 Carrington event. This was a powerful geomagnetic storm set off by a huge eruption on the sun known as a coronal mass ejection. A 2015 Cabinet Office report anticipated only 12 hours warning of a similar storm that could lead to power outages and other disruption. The discovery of more powerful solar storms in the past 3,000 years suggests that space weather can be worse than the UK plans for. “The Carrington event is often used as a worst-case scenario, but our research shows that this probably under-estimates the risks,” said Muscheler.

BLACK HOLES an essential component of our universe - Space Discovery Documentary

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All objects exert an attractive gravitational force which depends on their mass. Now, imagine an object with a very large mass which is concentrated into such a small volume that the gravitational field generated is powerful enough to prevent anything from escaping its clutches – even light. This bizarre concept intrigues everyone, in particular physicists who theorise about the nature of matter, space and time, and astrophysicists who look for real black holes out in space. Their study brings together the big ideas in fundamental science: Einstein’s theory of gravity – general relativity; the theory of the very small – quantum mechanics; and the origin and evolution of the universe – cosmology. In recent years scientists have sought the answers to questions such as does a black hole have a temperature? What exactly happens when an object falls into a black hole? How many black holes are there in our galaxy? What is the role of black holes in galaxy evolution?
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How the Universe Works - DARK FUTURE OF THE SUN - Space Discovery Documentary

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Our Sun has served Earth well for almost five billion years. It’s bathed us with heat and energy. But like humans, our home star is mortal. In five billion years, it will stop nurturing its planetary offspring. The aging star will bloat out beyond the orbit of our planet incinerating all living things–including humans if we’re still around.

How the Universe Works - National Geographic The Universe - Space Discovery Documentary

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How the Universe Works - Alien Storms & Black Holes - Space Discovery Documentary

At the centre of some black holes is 'an area where space and time exists' Colonies of aliens living on planets within black holes may not be as far-fetched as it sounds. Some black holes have a complex internal structure that allows photons, particles and planets to orbit a central singularity, according to one scientist. A singularity is the region in a black hole when space and time become infinite. However, Professor Vyacheslav Dokuchaev claims that at the centre of certain black holes, and under the right conditions, is an area where the fabric of space and time exists once more. If a charged and rotating black hole is large enough, he said, it can weaken the tidal forces that are beyond the event horizon - the point where nothing, not even light, can escape a black hole's gravity.

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