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
This artist’s conception shows the newly discovered alien planet also Known as OGLE-2014-BLG-0124Lb , which is about 13,000 light-years from Earth.
Astronomers have found an exoplanet nearly 13,000 light-years away, making it one of the most distant planets known to man. This discovery is important not because of the planet itself, a gas giant about half the size of Jupiter, but because what it means for the future of planetary discovery and mapping.
“For context, most of the planets we do know about are a factor of 10-100 times closer than OGLE-2014-BLG-0124,” Dr. Jennifer Yee, a NASA Sagan Fellow at the Harvard-Smithsonian Center for Astrophysics in Cambridge
Far, far away.
The microlensing technique has helped astronomers discover about 30 distant alien planets in our Milky Way’s bulge, the galaxy’s central area of mostly old stars, gas, and dust.
The farthest known exoplanet resides some 25,000 light years away in the bulge of our galaxy, Yee said in the email. The bulge is a very different environment from the Milky Way’s disk, where our own solar system is located.
According to Yee, no exoplanets have been found outside of our galaxy, which spans about 100,000 light years.
This artist’s map of the Milky Way shows the location of some of the farthest known exoplanets, including OGLE-2014-BLG-0124Lb.
Comparing planets to planets. Astronomers hope not only to gain a better understanding of the distribution of planets in the Milky Way, but also to gather enough detail about distant planets to compare them with those closer to Earth. More than 1,000 exoplanets closer to home have been discovered by the planet-hunting Kepler mission and ground-based observatories, Space.com reported.
“We would really like to know whether planets form in the central bulge of our galaxy the same way that they do here, near the sun, where the overwhelming majority of planets have been found,” Dr. Andrew Gould, professor of math and physical sciences at Ohio State University, and a co-author of the paper describing the newfound exoplanet, told The Huffington Post.
The Christian Science Monitor reported that the Spitzer telescope is scheduled to observe about 120 more “microlensing” events this summer, which could lead to the discovery of even more distant exoplanets.
This infographic explains how NASA’s Spitzer Space Telescope can be used in tandem with a ground-based telescope to measure the distances to planets using the “microlensing” technique.
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
Dark matter is a hypothetical kind of matter that cannot be seen with telescopes but accounts for most of the matter in the universe. Dark matter is estimated to constitute 84.5% of the total matter in the universe. It has not been detected directly, making it one of the greatest mysteries in modern astrophysics.
Hubble Image of Galactic Collision
A study of 72 large cluster collisions shows how dark matter in galaxy clusters behaves when they collide.
Image Showing How two Galaxies Collides
Astronomers have used data from NASA’s Hubble Space Telescope and the Chandra X-ray Observatory to find that dark matter interacts with itself less than previously thought. In an effort to learn more about dark matter, astronomers observed how galaxy clusters collide with each other — an event that could hold clues about the mysterious invisible matter that makes up most of the mass of the universe.
As part of a new study, published in the journal Science on Thursday, researchers used the Hubble telescope to map the distribution of stars and dark matter after a collision. They also used the Chandra observatory to detect the X-ray emission from colliding gas clouds.
“Dark matter is an enigma we have long sought to unravel,” John Grunsfeld, assistant administrator of NASA’s Science Mission Directorate in Washington, said in a statement. “With the combined capabilities of these great observatories, both in extended mission, we are ever closer to understanding this cosmic phenomenon.”
According to scientists, galaxy clusters are made of three main components — galaxies, gas clouds and dark matter. During collisions, the gas clouds bump into each other and gradually slow down. Galaxies, on the other hand, are much less affected by this process, and because of the huge gaps between the stars within them, galaxies do not slow each other down.
“We know how gas and stars react to these cosmic crashes and where they emerge from the wreckage,” David Harvey of the École Polytechnique Fédérale de Lausanne in Switzerland, and the study’s lead author, said in the statement. “Comparing how dark matter behaves can help us to narrow down what it actually is.”
The researchers studied 72 large galaxy cluster collisions and found that, like galaxies, the dark matter continued straight through the collisions without slowing down much, meaning that dark matter do not interact with visible particles.
“There are still several viable candidates for dark matter, so the game is not over. But we are getting nearer to an answer,” Harvey said.
Source : IBT times
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
Two galaxies drifted too close together between 100 and 200 million years ago, and began to drag at and disrupt one another’s structure and shape
At first glance,it looks like a giant rollercoaster loop.
However, this incredible image actually shows a ‘river’ of Sun-like stars that has been pulled deep into space by the gravitational tug of a bypassing galaxy
The golden loop is made of sun-like stars that have been pulled deep into space, far from the galaxy’s centre.
Experts say the galaxy, called NGC 7714, has witnessed some violent and dramatic events in its recent past.
Tell-tale signs of this brutality can be seen in NGC 7714’s strangely shaped arms, and in the smoky golden haze that stretches out from the galactic centre, they say.
The culprit is a smaller companion named NGC 7715, which lies just out of the frame of this image.
As a result, a ring and two long tails of stars have emerged from NGC 7714, creating a bridge between the two galaxies. This bridge acts as a pipeline, funnelling material from NGC 7715 towards its larger companion and feeding bursts of star formation. Most of the star-forming activity is concentrated at the bright galactic centre, although the whole galaxy is sparking new stars.
The galaxy is located approximately 100 million light-years from Earth in the direction of the constellation Pisces.
Astronomer believe that our Galaxy will also collide with its companion galaxy Andromeda after 4 billion years . Here is the Simulation of Galactic collision
Source : Dailymail , io9