For 25 years now, the Hubble Space Telescope (and many other satellites) has stimulated us with numerous jaw dropping images of space—stretching from the Great Nebula of Orion, to the Whirlpool Galaxy. They all look so huge and comprehensive, you can nearly imagine yourself moving through space, looking directly at them from up close—yet even the closest among them are unfathomably far away (the closest planet is nearly 162 million miles/261 million kilometers from sun, while the closest star is over 4 light-years distant). In a recent video, the Russian Space Agency (Roscosmos, to be exact) visualizes how our sky may look if some of these marvels were in nearer proximity to Earth. Watch the video below:
Astronomers have detected the universe’s largest known cosmological supervoid in the Southern constellation of Eridanus. Spanning some 1.8 billion light years !!!!!!!
(1 Light Years ~ 9 Trillion Kilometer)
It might be the single largest structure ever in the universe, and the only sign of it is nothing – just empty space 1.8 billion light years across. That’s 18,000 times larger than our entire galaxy.
the team remains mainly baffled as to why such an extensive void — in which the “density of galaxies is much lower than in the known universe” — could have actually arisen.
“This supervoid is certainly rare,” Greg Aldering, a cosmologist at Lawrence Berkeley National Lab in California, told Forbes. “Underdense by about 30 percent, it’s not completely empty. But what’s rare is the [spatial] extent of this void itself.”
Source : Forbes
Hubble Space Telescope marks 25th anniversary in orbit this week. So, There are some best images taken by Hubble Space Telescope during its 25 years journey. These Images are 100% real and contains no CGI
Hubble has traveled 3.4 billion miles, circling Earth nearly 137,000 times and making more than 1.2 million observations of more than 38,000 celestial objects, according to the Space Telescope Science Institute in Baltimore. The most distant objects spotted by Hubble — primitive galaxies — are some 13 billion light-years away and date to within 400 million or so years of the universe’s origin, known as the Big Bang.
Hubble provides an average of 829 gigabytes of archival data every month, according to the institute. Altogether, Hubble has produced more than 100 terabytes of data.
Some of the images have description about it. if anyone wants to read image description just click that image. and Enjoy……
Image Credit : hubblesite.org
Our sun is nearly 4.5 billion years — which means it missed the charming initial years of the Milky Way galaxy. If you were standing on a planet nearly about 10 billion years ago, when the Milky Way was pretty young, the night sky would have appeared very different. The image below is an artist’s impression of the night sky on a planet in a relatively young Milky Way-type galaxy, the way our galaxy was 10 billion years ago. You can see “the sky are ablaze with star birth. Pink clouds of gas harbor newborn stars, and bluish-white, young star clusters litter the landscape,” as NASA explains.
Image Credit: NASA/ESA/Z. Levay (STScI)
A recent study of young galaxies like our own demonstrates that as these galaxies slow down creating stars, they also stop developing as quickly in general. Which is quite logical. NASA explains:
“Astronomers don’t have baby pictures of our Milky Way’s formative years to trace the history of stellar growth so they studied galaxies similar in mass to our Milky Way, found in deep surveys of the universe. The farther into the universe astronomers look, the further back in time they are seeing, because starlight from long ago is just arriving at Earth now. From those surveys, stretching back in time more than 10 billion years, researchers assembled an album of images containing nearly 2,000 snapshots of Milky Way-like galaxies. The new census provides the most complete picture yet of how galaxies like the Milky Way grew over the past 10 billion years into today’s majestic spiral galaxies. The multi-wavelength study spans ultraviolet to far-infrared light, combining observations from NASA’s Hubble and Spitzer space telescopes, the European Space Agency’s Herschel Space Observatory, and ground-based telescopes, including the Magellan Baade Telescope at the Las Campanas Observatory in Chile.”
Above is a selection of Hubble Space Telescope photos, displaying how galaxies similar to our own developed over time.
Source : Physics-astronomy
The NASA/ESA Hubble Space Telescope has imaged a set of enigmatic quasar ghosts — ethereal green objects which mark the graves of these objects that flickered to life and then faded. The eight unusual looped structures orbit their host galaxies and glow in a bright and eerie goblin-green hue. They offer new insights into the turbulent pasts of these galaxies.
Hubble Space Telescope has discovered manifestations from the remote past, bright streams of gas, which look like immense looped objects glowing green, once ionized by quasars that no longer exist.
The telescope, which will turn 25 in 20 days, has taken photos of eight unusual space objects glowing emerald in the depths of space. Light emitting space areas dubbed ‘Hanny’s Voorwerp’ are tens of thousands of light years across.
The first object of this kind was spotted by Dutch schoolteacher Hanny van Arkel in 2007.
The ethereal wisps in these images were illuminated, perhaps briefly, by a blast of radiation from a quasar — a very luminous and compact region that surrounds a supermassive black hole at the center of a galaxy. Galactic material falls inwards towards the central black hole, growing hotter and hotter, forming a bright and brilliant quasar with powerful jets of particles and energy beaming above and below the disc of infalling matter.
In each of these eight images a quasar beam has caused once-invisible filaments in deep space to glow through a process called photoionisation. Oxygen, helium, nitrogen, sulphur and neon in the filaments absorb light from the quasar and slowly re-emit it over many thousands of years. Their unmistakable emerald hue is caused by ionised oxygen, which glows green.
hese objects were found in a spin-off of the Galaxy Zoo project, in which about 200 volunteers examined over 16 000 galaxy images in the SDSS to identify the best candidates for clouds similar to Hanny’s Voorwerp. A team of researchers analysed these and found a total of twenty galaxies that had gas ionised by quasars. Their results appear in a paper in the Astronomical Journal.
Source : RT , Spacetelescope.org
Scientists say they have discovered a black hole so big that it challenges the theory about how they grow.
The scientists were initially reluctant to classify it as a black hole because it was too bright, its luminosity equal to the brightness of 420 trillion suns. Most of the people do not believe black holes to be bright, though they can be. This is particularly so because black holes suck everything inside them but just before that there is tremendous friction which produces a lot of light.
Scientists said this black hole was formed about 900 million years after the Big Bang.
But with measurements indicating it is 12 billion times the size of the Sun, the black hole challenges a widely accepted hypothesis of growth rates.
“Based on previous research, this is the largest black hole found for that period of time,” Dr Fuyan Bian, Research School of Astronomy and Astrophysics, Australian National University (ANU).
“Current theory is for a limit to how fast a black hole can grow, but this black hole is too large for that theory.”
The creation of supermassive black holes remains an open topic of research. However, many scientists have long believed the growth rate of black holes was limited.
Black holes grow, scientific theory suggests, as they absorb mass. However, as mass is absorbed, it will be heated creating radiation pressure, which pushes the mass away from the black hole.
“Basically, you have two forces balanced together which sets up a limit for growth, which is much smaller than what we found,” said Bian.
The black hole was discovered a team of global scientists led by Xue-Bing Wu at Peking University, China, as part of the Sloan Digital Sky Survey, which provided imagery data of 35 percent of the northern hemisphere sky.
The ANU is leading a comparable project, known as SkyMapper, to carry out observations of the Southern Hemisphere sky.
Bian expects more black holes to be observed as the project advances.
Source : Reuters , ScienceTimes
Hubble Takes a Amazing Picture which seems like Happy Face in the Space.
Of course, this is neither a miracle nor a edited picture.
The reason behind this ‘Happy face’ is very Complex Phenomena called Gravitational Lensing. The Eyes of the face are two Galaxies but Face’s smile is due to gravity. Gravitational lensing is one of the most fascinating thing in Physics and astronomy.
This picture shows the true power of gravity. The gravity of these massive galaxies are so intense that they even distort the space-time create this amazing lens effect. The light itself distorted and gives the magnified view of galaxies.
Some astronomer believes that it is because of Dark matter, an unknown matter which is yet to be discover. These images are the strong evidence of dark matter but further research and experiments are needed to entirely prove their existence.
Hubble takes many images which shows gravitational lensing
(Click Image to Download)
A giant doorway to another galaxy may exist at the centre of the Milky Way, a study suggests.
Scientists believe that dark matter at the centre of our galaxy could sustain a wormhole that we could travel through.
Wormholes are areas where space and time are being bent so that distant points are now closer together.
Einstein predicted them in his theory of General Relativity but nobody knows how they could be held open so that someone could travel through. Most scientists believe that It is extremely unlikely they could exist naturally in the universe. It would take a huge mass, like a Neutron star, to create a bend in time which could bend space time enough to meet another tunnel on the other side. No natural examples have ever been detected.
“If we combine the map of the dark matter in the Milky Way with the most recent Big Bang model to explain the universe and we hypothesise the existence of space-time tunnels, what we get is that our galaxy could really contain one of these tunnels, and that the tunnel could even be the size of the galaxy itself,” said Professor Paulo Salucci.
“But there’s more. We could even travel through this tunnel, since, based on our calculations, it could be navigable. Just like the one we’ve all seen in the recent film ‘Interstellar“‘.
He said the research was surprisingly close to what was depicted in director Christopher Nolan’s movie, for which theoretical physicist Kip Thorne provided technical assistance.
“What we tried to do in our study was to solve the very equation that the astrophysicist ‘Murph’ was working on,” said Prof Salucci. “Clearly we did it long before the film came out.”
Wormholes bend space-time to allow distant regions to meet
Any wormholes existing in nature have previously been assumed to be microscopic pinpricks in the fabric of space-time.
But the one possibly lying at the centre of the Milky Way would be large enough to swallow up a spaceship and its crew.
Prof Salucci added: “Obviously we’re not claiming that our galaxy is definitely a wormhole, but simply that, according to theoretical models, this hypothesis is a possibility.”
Other “spiral” galaxies similar to the Milky Way – like its neighbour Andromeda – may also contain wormholes, the scientists believe.
Theoretically it might be possible to test the idea by comparing the Milky Way with a different type of nearby galaxy, such as one of the irregular Magellanic Clouds.
In their paper, the scientists write: “Our result is very important because it confirms the possible existence of wormholes in most of the spiral galaxies ..
“Dark matter may supply the fuel for constructing and sustaining a wormhole. Hence, wormholes could be found in nature and our study may encourage scientists to seek observational evidence for wormholes in the galactic halo region.”
The theory was published in the journal Annals of Physics.
Source : Telegraph
In 1995, the Hubble Space Telescope captured what would become one of history’s most enduring images of the universe: The Eagle Nebula’s Pillars of Creation. Now, 20 years later, Hubble has released a collection of brand new, high-definition shots of the iconic formation.
If you thought the universe was hauntingly beautiful before, wait until you see these.
Eagle Nebula Captured by Hubble Space Telescope (Click Image to Download)
Comprised of three towers of gas, dust and space matter, structures like this are not altogether uncommon in star-forming regions. But as the Hubble website notes, the Pillars of Creation are some of the most photogenic and mesmerizing examples ever seen.
“The Hubble image of the pillars taken in 1995 is so popular that it has appeared in film and television, on tee-shirts and pillows, and even on postage stamps,” HubbleSite writes.
The telescope used the Wide Field Camera 3 to capture the stunning new images. It sees near-infrared light, visible like and near-ultraviolet radiation, and also has higher resolution and a bigger field of view than the camera that came before it.
This time, Hubble also captured an image taken in infra-red light, which “penetrates much of the obscuring dust and gas and unveils a more unfamiliar view of the pillars,” according to the website. “Here newborn stars, hidden in the visible-light view, can be seen forming within the pillars themselves.”
Not everything is happy-go-lucky in Pillars of Creation-land, however. Despite their name, the new shots indicate that the pillars are also being worn down by the very stars they are helping to incubate. “The dust and gas in these pillars is seared by intense radiation from the young stars forming within them, and eroded by strong winds from massive nearby stars,” HubbleSite explains.
Arizona State University’s Paul Scowen, who helped lead Hubble’s first deep dive into the Eagle Nebula, stressed just how incredible our sightings of the Pillars are. “I’m impressed by how transitory these structures are,” he said in a press release. “We have caught these pillars at a very unique and short-lived moment in their evolution.”
Interestingly, environments like the Eagle Nebula and other star-forming regions were instrumental in our own solar system’s development. “What that means is when you look at the environment of the Eagle Nebula or other star-forming regions, you’re looking at exactly the kind of nascent environment that our Sun formed in,” Scowen said.
Source : mic.com