How Large is the Universe? & The Birth of New Galaxy - Space Discovery Documentary
Our brains struggle to comprehend how big the universe is because everything here on Earth, and even the Earth itself, is very small when compared to the immense scale of the universe.
So let's think about it a different way, using something we see and interact with every day… light.
While we imagine light to be instantaneous, photons of light actually take time to travel from one side of the room to the other.
In the time it took you to read this far, a photon of light leaving the Sun has travelled about 10 million kilometres – equivalent to travelling around the Earth 250 times.
Light that leaves our second nearest star, Proxima Centauri, takes just over four years to reach Earth and so we can define it as four light years away.
As such, if you were to look at Proxima Centauri, you would not be seeing the star as it is right now, but how it 'was' 4 years ago!
We see all things in the universe as they were in the past, whether they're on the other side of the room or the other side of the galaxy.
To take this concept further, the nearest large galaxy to us is Andromeda which is so big and close that you can see it in the night sky with your naked eye.
What you're really seeing is 1,000's of billions of stars in a configuration similar to our Milky Way. However, all of those stars are about 2.5 million light years away, which means you're seeing Andromeda as it was 2.5 million years ago.
How the Universe Works - Black Hole in the Milky Way - Space Documentary
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.
What is the most powerful object in the universe? - Space Discoveries and Theories
A supermassive black hole is the largest type of black hole, containing a mass of the order of hundreds of thousands, to billions times, the mass of the Sun. This is a class of astronomical objects that has undergone gravitational collapse, leaving behind a spheroidal region of space from which nothing can escape; not even light.
Observational evidence indicates that all, or nearly all, massive 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.
Life On Another Planet - Are We Alone in the Universe? - Space Discovery Documentary
Planets in the hundreds of billions are likely caught up in the vast whirlpool of the Milky Way galaxy. From Earth, a lonely outpost on one of its spiral arms, we’ve begun to peer across the void. We can already make out, dimly, the light from planets orbiting distant stars. We’ve even tasted a few of their atmospheres by dissecting those faint traces of light.
But the ultimate goal of NASA's exoplanet program is to find unmistakable signs of current life. How soon that can happen depends on two unknowns: the prevalence of life in the galaxy and how lucky we get as we take those first, tentative, exploratory steps.
Amazing Recent Discoveries Made In Space
Space is amazing. Over the years, NASA's revealed some unusual mysteries about it. Lets find out amazing the most amazing recent discoveries made in space!
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Secrets of Our Universe and Solar System Planets - Space Science Documentary
Our Solar System, and all other star systems, form from a collapsing nebula. Often called stellar nurseries, nebulae are the birthplace of stars. They are made up of mostly hydrogen but also contain other matter like gases, dust, ice and rock. The gravity of the nebula pulls this matter into the centre, and the nebula experiences a gravitational collapse. If the compression raises the core temperature enough to reach thermonuclear fusion, the centre mass generates a protostar. This process takes about 10 million years.
LIVE | Technical prelaunch briefing for June 24 SpaceX Falcon Heavy launch
LIVE | SpaceX Falcon Heavy NASA technology payloads STP-2 Mission | Launch & Landing if you want watch this launch, can you go this broadcast :
Technical prelaunch briefing for June 24 SpaceX Falcon Heavy launch. Subject matter experts will explain each NASA mission onboard and answer questions, including from social media (use #askNASA). Learn about the Deep Space Atomic Clock, Space Environment Testbeds (SET), Green Propellant Infusion Mission and Enhanced Tandem Beacon Experiment.
Credit : SpaceX / NASA
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This video has been used with SpaceX permission here :
Launch standby image is Archive.
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Space Exploration Magellanic clouds - Space Discovery Documentary
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Nearly 200,000 light-years from Earth, the Large Magellanic Cloud, a satellite galaxy of the Milky Way, floats in space, in a long and slow dance around our galaxy. Vast clouds of gas within it slowly collapse to form new stars. In turn, these light up the gas clouds in a riot of colors, visible in this image from the NASA/ESA Hubble Space Telescope.
The Large Magellanic Cloud (LMC) is ablaze with star-forming regions. From the Tarantula Nebula, the brightest stellar nursery in our cosmic neighborhood, to LHA 120-N 11, part of which is featured in this Hubble image, the small and irregular galaxy is scattered with glowing nebulae, the most noticeable sign that new stars are being born.
The LMC is in an ideal position for astronomers to study the phenomena surrounding star formation. It lies in a fortuitous location in the sky, far enough from the plane of the Milky Way that it is neither outshone by too many nearby stars, nor obscured by the dust in the Milky Way’s center. It is also close enough to study in detail (less than a tenth of the distance of the Andromeda Galaxy, the closest spiral galaxy), and lies almost face-on to us , giving us a bird’s eye view.
The Earth is Not Alone - Space Documentary HD
People began traveling in space in 1961 in tiny spacecraft called capsules, which were launched from Earth by powerful rockets. Russian crews still travel in this kind of craft, in Soyuz capsules, but Americans now travel into space in shuttles, which are rocket-powered space planes.
HOW DO HUMANS SURVIVE IN SPACE?
There is no oxygen in space, so all crewed spacecraft carry a life-support system. This supplies air for people to breathe. The system also includes equipment to keep the air at a comfortable temperature and pressure and to remove carbon dioxide and odors.
HOW DOES SPACE TRAVEL AFFECT PEOPLE?
Gravity in space is much weaker than it is on Earth. When people travel in space, they seem to become weightless. This often makes them feel sick. Their bodies do not have to work as hard, because they are not fighting gravity to sit or stand up. If they stay in space for a long time, the lack of gravity makes their muscles start to waste away. Exercise and a special diet help to combat these effects.
WHAT IS THE FARTHEST ANYONE HAS TRAVELED IN SPACE?
Astronauts on the APOLLO PROJECT traveled to the Moon, about 239,000 miles (385,000 km) away. Russian cosmonaut Valeri Poliakov traveled a distance of about 174 million miles (280 million km) around Earth while in the Mir space station.
In the space race of the 1960s, the US Apollo Project beat the Soviet Union by landing the first astronauts on the Moon. The first Moon landing, by Apollo 11, took place on July 20, 1969, when Neil Armstrong and Buzz Aldrin became the first humans to set foot on another world.
WHAT WAS THE APOLLO SPACECRAFT LIKE?
The Apollo spacecraft was launched from Earth by the Saturn V rocket. On the launch pad, the whole assembly stood 365 ft (111 m) tall. The spacecraft itself weighed 50 tons (45 metric tons). It was made from three main modules (sections). The command module for flight control housed the three-person crew. The service module carried equipment, fuel, and a rocket motor. The lunar module detached from the craft and landed two astronauts on the Moon’s surface.
HOW MANY APOLLO LANDINGS WERE THERE?
There were six Moon landings, beginning with Apollo 11 in July 1969 and ending with Apollo 17 in December 1972. During the missions, 12 astronauts explored the lunar surface for a total of over 80 hours and brought back nearly 880 lb (400 kg) of Moon rock and dust for examination on Earth.
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What Happened to Lost Women in Space?
Achille and Giovanni were italian brothers. They were passionate radio operators. In november 1963, they captured a weird signal coming directly from the space.
When they decoded the signal, it was the voice of a female. She was scared; in pain and asking for the help. It's believed that, she was the first female to enter space.
What Happened to ham in space? Watch here
What If You Died in Space?
If you were exposed to the harsh depths of space, you’d lose consciousness in 15 seconds, and be dead within 30 seconds to 1 minute.
But what if you’re wearing an advanced powerful spacesuit? Well, that would buy you about 6 hours before your oxygen runs out, and then you’d still be dead.
So what would happen to your body? Would someone come to retrieve it? Or would it just keep floating through space forever?
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About What If: Produced by Underknown in Toronto, Canada, What If is a mini-documentary web series that takes you on an epic journey through hypothetical worlds and possibilities. Join us on an imaginary adventure — grounded in scientific theory — through time, space and chance, as we ask what if some of the most fundamental aspects of our existence were different.
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Imagination will often carry us to worlds that never were. But without it, we go nowhere. — Carl Sagan
REPLAY: ISS Expedition 59 crew returns to Earth from space (6/24/2019)
This is a replay of the live stream, with archived live chat messages.
3:30 pm EDT (1930 GMT) - ISS Expedition 59 farewells and Soyuz MS-11 hatch closure coverage begins (Oleg Kononenko, David Saint-Jacques, Anne McClain)
4:10 pm EDT (2010 GMT) - Hatch closure scheduled.
7:00 pm EDT (2300 GMT) - Undocking coverage begins.
7:24 pm EDT (2324 GMT) - Undocking scheduled.
9:30 pm EDT (0130 GMT) - Deorbit burn and landing coverage begins.
9:54 pm EDT (0154 GMT) - Deorbit burn scheduled.
10:48 pm EDT (0248 GMT) - Landing near Dzhezkazgan, Kazakhstan scheduled.
Intro music: CO.AG - The Earth in 100 Years
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Outro music: CO.AG - Anything is Possible
Outro video clips courtesy NASA and SpaceX
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Why All Images of Space Are Photoshopped - Cheddar Explores
NASA, and most if not all, other space agencies photoshop their images of space - but that doesn't mean their photos are fake. In this video Cheddar explores why images of space are photoshopped, and how that helps astronomers with their job.
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Top 10 Scary SIGNALS From Space
Top 10 Scary SIGNALS From Space. There are many weird and strange recordings from space that even experts can't explain what these sounds are. Listen carefully as we give you the Top 10 Scary SIGNALS From Space.
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What Happened to Ham in Space? *Sad Story of Ham*
Ham was a normal chimpanzee. Purchased by the US Air Force at the age of 2. He was smart and fast learner compared to others.
So NASA decided to launch him in Space. On 31 January 1961, Ham was launched in space inside the Mercury-Redstone rocket.
In the beginning everything was fine but soon after launch NASA lost control and because of it Ham's rocket reached 252km in Space. Somehow they got the control back and Ham's rocket returned back to Earth.
He landed hard in the Atlantic Ocean & somehow survived the impact. That day Ham became the first chimpanzee in space.
After the flight, Ham lived all alone in a zoo for the next 17 years. Ham died on January 17, 1983.
What Happened to Felicatte in Space? Watch video
Weirdest Planets and Possibility of Life in outer Space - New Documentary
Weirdest Planets and Possibility of Life in outer Space - New Documentary 2016
Lancio Falcon Heavy (SpaceX) con Space Test Program 2 [Commento Live]
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NOTA: prima dell'evento principale, seguiamo anche il ritorno a casa di tre astronauti dalla ISS con una navicella Soyuz
Il più potente razzo al mondo sta per lanciare un gruppo di piccole grandi missioni e nuovi esperimenti scientifici. Da nuovi carburanti ad una vela solare! Conosciamogli meglio e seguiamo insieme la partenza.
Qui per ulteriori dati sul Falcon Heavy
E la missione STP_2
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EHI! ho scritto un nuovo libro sull'esplorazione del sistema solare, ed in particolare da Giove ad Ultima Thule, si chiama
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HOW IT WORKS: The International Space Station
This explains each interior area, crew living quarters, and scientific equipment.
The Quasar from The Beginning of Time | STELLAR
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Recently, the oldest quasar ever seen was discovered by the Gemini North telescope in Hawaii, the Magellan Telescopes at Las Campanas Observatory in Chile, as well as the Large Binocular Telescope in Arizona. In this first episode of the PBS DS mini-series, STELLAR, Matt travels to the top of Mauna Kea to visit the Gemini North telescope and see just how they found this ancient Quasar and it’s massive black hole.
Stellar is a brand new miniseries done in collaboration with Dianna Cowern from @Physics Girl and Joe Hanson from @It's Okay To Be Smart Over six episodes we travel to some of the world's most important telescopes, go inside amazing space research centers, and talk with brilliant scientists. Next up, Dianna from Physics Girl visits LIGO observatory in Washington that detected the very first gravitational waves. Then Joe Hanson visits one of the telescopes that was part of world spanning Event Horizon Telescope.
You'll be able to see future episodes on the Physics Girl and It’s Okay to be Smart YouTube channels, as well as the PBS Digital Studios Facebook page.
Stellar is a part of the PBS Summer of Space. They'll be lots of awesome space related content all summer long on PBS. See what's happening at
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Special Thanks to Joy Pollard and Gemini Observatory for all their help making this episode.
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10 Scary Yet Beautiful Facts About Space & Us
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