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The Might and Mystery of Black Holes - How the Universe Works
 
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In science fiction, black holes are often portrayed as some kind of menacing threat to the safety of the whole Universe, like giant vacuum cleaners that suck up all of existence. Now, in this episode, we're going to separate the fiction from the facts and we're going to look at the real science behind black holes and how Hubble has contributed to it. Black holes come in different sizes. We've had solid evidence for the smaller ones since the 1970s. These form when a huge star explodes at the end of its life. As the outer layers are blown away, the star's core collapses in on itself forming an incredibly dense ball. For instance, a black hole with the same mass as the Sun would have a radius of only a few kilometres. These black holes won't suck you in unless you get very close to them though. In fact, contrary to popular belief, a black hole the size of the Sun doesn't actually exert any more gravitational pull than the Sun does. But these stellar black holes are just part of the story. Before Hubble was launched, astronomers had noticed that the centres of many galaxies were somehow much denser and brighter than they were expected to be. And so they speculated that there must be some kind of huge, massive objects lurking in the centres of these galaxies in order to provide the additional gravitational attraction. Now, could these objects be supermassive black holes, that is, black holes which are millions or even billions of times more massive than the stellar ones? Or was there perhaps a simpler, less exotic explanation, like giant star clusters? Frustratingly, at that time, telescopes just weren't quite powerful enough to see enough detail to solve the mystery. Fortunately, Hubble was on its way, along with a range of other high-tech telescopes. When the space telescope was being planned, the search for supermassive black holes was in fact one of its main objectives. Some of Hubble's early observations in the 1990s were dedicated to these dense, bright galactic centres. Where ground-based telescopes were just seeing a sea of stars, Hubble was able to resolve the details. In fact, around the very centres of these galaxies, Hubble discovered rotating discs of gas and dust. When Hubble observed the disc at the centre of a nearby galaxy, Messier 87, the astronomers saw that its colour was not quite the same on both sides. One side was shifted towards blue and the other towards red, and this told the scientists that it must have been rotating very quickly. This is because the wavelength of light is changed by the motion of an object emitting it. Think about how the pitch of an ambulance siren drops as it drives past you, because the sound waves are more spaced out as the vehicle moves away. Similarly, if an object is moving towards you, the light's wavelength is squashed, making it bluer; if it's moving away, it's stretched, making it redder. This is also known as the Doppler effect. So, by measuring how much the colours had shifted on either side of the disk, astronomers were able to determine its speed of rotation. And it turned out that this disk was spinning at a rate of hundreds of kilometres per second. This in turn allowed astronomers to deduce that, hidden at the very centre, there must be some kind of object which was two to three billion times the mass of our Sun — and this was very likely a supermassive black hole. Now, along with a lot of other observations, this was a key piece of evidence that led to the notion that there is a supermassive black hole lurking at the centre of most, if not all, giant galaxies, including our own Milky Way. So far, so good. But this work was almost 20 years ago — what does it tell us about cutting-edge science today? Well, the science of black holes has moved along a lot since then. The mystery now isn't whether they exist, but why they behave in the strange ways they do. For example, Hubble observations have helped to show that the mass of a black hole is closely related to the mass of its surrounding host galaxy. The bigger the black hole, the bigger the galaxy. Now the reason for this is totally unclear. #blackholes #Universe #Space
Views: 231205 How the Universe Works
Purple sunset.   Quicksand scene.
 
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A girl who is a prisoner of war is sucked under after she falls into a swamp in this clip.
Views: 66065 saira paris
Quicksand 34
 
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Would you know, this guy is one of the only ones to find water in the desert at night, and a great mud hole on top of it. What is worst he just get in it and ruins it for the rest of us girls
Views: 59298 jaspersquid
Voyage to the Bottom of the Sea   S01E01   Eleven Days to Zero
 
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Voyage to the Bottom of the Sea S01E01 Eleven Days to Zero
Views: 15488 Joel Kremen
1965-66 Television Season 50th Anniversary Tribute: Voyage to the Bottom of the Sea
 
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Continuing with our review of this special season and the 'Space/Sci-Fi/Fantasy segment of the schedule, today we look at one of television's all-time outstanding producers, Irwin Allen, and his first big hit on television - Voyage to the Bottom of the Sea. This clip is from the outstanding 1995 TV documentary special: 'The Fantasy Worlds of Irwin Allen', and features host June Lockhart (more on her big hit series Lost In Space this coming week!) and interview with one of my all time heroes, David Hedison. Hedison played Seaview Commander Lee Crane, and co-starred with Richard Basehart, who played Admiral Harriman Nelson. Also shown in this clip are scenes from the pilot episode, which also guest starred one of the television's best and favorites - Eddie Albert (more on Mr. Albert later this month!) Voyage to the Bottom of the Sea ran four seasons on ABC, from September 14, 1964 to March 31, 1968. Like so many other television series honored here at Television Vanguard, 'Voyage' is also available on DVD box sets - outstanding series and DVD collection. Like so many other series during this 1960's era, 'Voyage' was filmed in black and white during the 1964 and 1965 seasons, and in color during the final two+ seasons from 1965-1968. We'll be paying tribute to the great Irwin Allen all this coming week, but it is important to learn just how much he and Gene Rodenberry in particular advanced the technology behind special efforts on television series. Both men had amazing minds and imaginations, and television is all the better for it. This video clip is presented here on YouTube for the entertainment and informational value of the viewer, and no copyright infringement is intended. Enjoy!
Views: 21559 TelevisionVanguard
Voyage to the Bottom of the Sea (1964) Season 1 Episode 3
 
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Check out the official Desireless channel and support the artist! chanson sous titrée. European smash hit. Watch the official lyric video for The Voyage from the album, Brave New World by Amanda Cook. Get the album via iTunes: Or on . Voyage - Souvenirs.
Views: 9412 Adrian Lanzarin
Elton John - "Circle Of Life" (Live in Las Vegas, NV)
 
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Elton John peforming "Circle Of Life" during The Million Dollar Piano show at Caesars Palace in Las Vegas, NV on October 8, 2011. This show was a milestone for Elton because it was his 3000th live public performance of all time.
Views: 316717 Logan Wilks
Voyage to the Bottom of the Sea   S02E14   Terror on Dinosaur Island
 
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voyage to the bottom of the sea,
Views: 5731 Marvin Livingston
Voyage to the Bottom of the Sea   S04E21   Savage Jungle
 
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voyage to the bottom of the sea,
Views: 4338 Marvin Livingston
Voyage to the Bottom of the Sea S03E16 Death from the Past - (All Episodes)
 
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Views: 33554 Ofe Lag
Voyage to the Bottom of the Sea   S03E14   The Brand of the Beast
 
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voyage to the bottom of the sea,
Views: 5923 Marvin Livingston
Voyage to the Bottom of the Sea - Color Pilot Opening Titles
 
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Fox video's supposedly "re-cut" color version of the pilot on the Season 4, Vol. 1 set was to my understanding supposed to restore the original opening titles, replacing the second season opening that was previously inserted for God knows what reason. Here are the original titles as they appeared on the Columbia House videos from not too many years ago. I also have an off-air recording from the mid-1980's which is identical. So what's the deal with the DVD's?
Views: 42455 leo81960
Voyage to the Bottom of the Sea   S03E03   The Day the World Ended
 
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voyage to the bottom of the sea,
Views: 2918 Marvin Livingston
Voyage to the Bottom of the Sea   S01E17   The Last Battle
 
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Voyage to the Bottom of the Sea S01E17 The Last Battle
Views: 1531 Joel Kremen
Die Büchse der Pandora - Pandora´s Box
 
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Director: Georg Wilhelm Pabst Story: Frank Wedekind New Score: Dominik Schuster Conductor: Stefan Geiger Romanian National Youth Orchestra Actors: Louise Brooks, Francis Lederer, Fritz Kortner, Alice Roberts, Carl Goetz
Views: 53359 Dominik Schuster

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