Actually, even the supercluster has a mass equaling some thousand trillion suns, virtually all its volume is empty in such a vast Andromeda Galaxy space. The evidence, at first indirect, began to accumulate in 1975: stars and gas tracked in the middle of the Milky Way did not follow the orbits they would if the spiral pattern reached all the way in
The remarkable achievement sets new standards for ongoing efforts at photographic mapping of the over 100 billion spiral galaxies in the visible universe. 6, 2015, provides an animated version of the image that affords an opportunity to appreciate the gigantic scale of the galactic structure captured in a single panoramic swoop
The word galaxy comes from a Greek word meaning "milky circle" or, more familiarly, "milky way." The white band of light across the night sky that we call the Milky Way was observed and described poetically long before Galileo examined it with a small telescope. A composite of images made at X-ray (blue), infrared (green), and radio (red) shows the relation between hot gas (X-ray), cool gas and dust (infrared) and high energy electrons trapped in the magnetic field in the Galactic center (radio)
Andromeda And The Milky Way Might Collide Sooner Than We Think
To find and study the halo, the team sought out quasars, distant star-like objects that radiate tremendous amounts of energy as matter funnels into the supermassive black holes in their cores. Extending for at least 2 million light years, if we could see in our night sky it would be 100 times the diameter of the Moon or 50 degrees across! Credit: NASA University of Notre Dame astrophysicist Nicholas Lehner led a team of scientists using the Hubble Space Telescope to identify an enormous halo of hot, ionized gas at least 2 million light years in diameter surrounding the galaxy
The corrugated galaxy: Milky Way may be much larger than previously estimated
I find it kinda sad, but amusing at the same time, that they always seem to assume a "bullseye" collision, when, as everyone in the whole world knows, the odds against are --literally-- astronomical. Could the Milky Way become a quasar? February 27, 2015 A quasar is what you get when a supermassive black hole is actively feeding on material at the core of a galaxy
Present day; 2 billion years from now; 3.75 billion years; 3.85 billion years; 3.9 billion years; 4 billion years; 5.1 billion years from now; and 7 billion years from now, when the galaxies have formed a huge elliptical galaxy. For eons, the pair will continue to come together and fly apart, scrambling stars and redrawing constellations until eventually, after a billion or so years have passed, the two galaxies merge
May 31, 2012, 9:11 PM Carl Sagan said that the Last Good Day on earth was about 5 billion years away, before expanding Sol slowly heats its inner rocky planets in a slow-absorb as it swells into a red giant. If we consider that our sun has left some 4,000 million years and that within 3,000 million earth will be engulfed by the resulting red giant, it is impossible to think that our solar system as we know it, keep the same configuration
Immense Halo Discovered Enveloping the Andromeda Galaxy --1,000 Times Greater Than Anticipated
The team also determined that it is enriched in elements much heavier than hydrogen and helium, and the only way to get these heavy elements is from exploding stars called supernovae. Many previous Hubble campaigns have used quasars to study gas much farther away than -- but in the general direction of -- Andromeda, so a treasure trove of data already existed
Milky Way Collision
When the galaxies collide, there is little chance that many stars will slam into each other directly because they are so spread out; however, the gas that lies between the stars can collide, heat up and trigger the formation of new stars. Andromeda and the Milky Way will pass through each other once, then fall apart for about a billion years, then pass again, and again until finally settling down to merge completely about 5 billion years from now
Andromeda Galaxy Photos: Amazing Pictures of M31
Mellinger This photo illustration depicts a view of the night sky just before the predicted merger between our Milky Way galaxy and the neighboring Andromeda galaxy. The image on the left shows a sum of Chandra images taken before January 2006 and the image on the right shows a sum of images taken after January 2006
For example, billions of small reflective bits of metal could be placed in an orbit between earth and sun, possibly at the L1 Lagrangian point (so they would stay in the same relative place from earth as we go around the sun). New data collected by the Hubble Space Telescope proves, NASA says, that in 4 billion years the Milky Way and Andromeda will collide or pass each other by so closely that the gravitational force each exerts on the other will cause them to slow down to the point of merging
Hubble Finds Giant Halo Around the Andromeda Galaxy
.......they measured the mass alright, but you forgot to read their conclusion about the "mass" of the halo: "The gargantuan halo is estimated to contain half the mass of the stars in the Andromeda galaxy itself, in the form of a hot, diffuse gas." Dark matter really is not that weird of an idea. Could the Milky Way become a quasar? February 27, 2015 A quasar is what you get when a supermassive black hole is actively feeding on material at the core of a galaxy
Hubble finds giant halo around the Andromeda galaxy -- ScienceDaily
The properties of these gaseous halos control the rate at which stars form in galaxies according to models of galaxy formation," explained the lead investigator, Nicolas Lehner of the University of Notre Dame, Indiana. The team also determined that it is enriched in elements much heavier than hydrogen and helium, and the only way to get these heavy elements is from exploding stars called supernovae
The Hubble Space Telescope's deep views of the universe show such encounters between galaxies were more common in the past when the universe was smaller. The Hubble Space Telescope team, led by van der Marel, conducted extraordinarily precise observations of the sideways motion of M31 that remove any doubt that it is destined to collide and merge with the Milky Way
They estimated that it contains at least as much mass in its diffuse gas as half of the stars in the Andromeda Galaxy, which also goes by the name of Messier 31, or the punchier M31. Why CIOs should rethink endpoint data protection in the age of mobility Assessing trends in data protection, specifically with respect to mobile devices, BYOD, and remote employees
Identical in form and function with its sister craft, Voyager 1, it was launched on a slower, more curved trajectory that allowed it to be kept in the plane of the ecliptic. It is bright enough to be visible during daytime on Earth, while at night, it is similar to the full moon.* Of much greater concern, however, are the lethal jets of gamma radiation released by the dying star
Once that happens, the two galaxies will become bound, dance around, and eventually merge to become one large elliptical galaxy -- over the next few billion years. Pictured above is an artist's illustration of the sky of a world in the distant future when the central parts of each galaxy begin to destroy each other
The faint outer parts of a spiral galaxy are more susceptible to warping because they are less strongly bound by the gravitational and other forces that keep disk stars in a plane and are also more susceptible to the influence of neighboring galaxies. In this 2010 infrared image, dust heated by newborn, massive stars are depicted in yellow and red, which trace out the spiral arms, while mature stars are colored blue (more)
The scientists said: The galaxy is now 2.5 million light-years away, but it is inexorably falling toward the Milky Way under the mutual pull of gravity between the two galaxies and the invisible dark matter that surrounds them both. For decades, astronomers have been saying that our home galaxy, the Milky Way, is destined someday to collide with the next-nearest spiral galaxy, in the direction of the constellation Andromeda
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