Is this true or false: The term "active galaxy" refers to 1 that's undergoing rapid evolutionary change in...?
968415
It is false. An "active" galaxy is one which is emitting larger than average amounts of radiation, generally in the infrared and radio frequencies. It could also apply to one active in the X-ray spectrum. The causes for these emissions can be several: The effects of two galaxies in collision(when they collide, the stars don't collide but the clouds of gas and dust do) A galaxy with a large and growing black hole at its center, A galaxy which is undergoing a large amount of new stellar formation ( now thought to be caused by gravity waves in the gas and dust clouds.
768523
It's due to a process of vortical adduction dynamics.  Galaxies are not centrifugal (spinning outwardly), they spin inwardly.  Hence, this is why the centers of galaxies are utterly ancient, because stellar material is gravitated from the outer terminus to the core of the galactic system.  Consequently, the youngest matter is at the outer extremity and the older matter is in the center, i.e. Black Holes.  Conventional astronomy categorizes the various galaxy "types" as independent forms, but the reality is all galaxies “evolve” through a maturation process beginning with; \n1) the young dust filled Irregular Galaxies; \n2) that eventually evolve into Barred Galaxies;\n3) which transform into Spiral Galaxies; \n4) then the spiral arms contract inward creating Bulging Galaxies (the Sombrero Galaxy is a good example); \n5) next they condense into Elliptical Galaxies;\n6) and then ultimately they become deadly Seyfert Galaxies.\n\nIt’s complex to explain, but vortical adduction dynamics is generated by an oscillating concentric reticulation field across the vast fabric of the Known Universe.  The galaxies form through an autocatalytic process on the high crests of this vast web-like structure, and travel along these arteries.  Many other components come into play and are required, i.e. temperature and the essential horizontal plane of the universe.  The best way to understand this is to rapidly tap the side of a clear plastic water cooler and note the pattern produced on the surface sheet of the water.  The concentric waves will collide and intermingle until a continual resonance establishes the vibratory reticulation field.  It will look somewhat like a concentric spider web separated by four-sided valley-like cupularies.  The galaxies do not enter these low zones, but are confined to the crests surrounding these zones.
21164
4 In recent centuries astronomers who scanned the heavens with early telescopes noticed some fuzzy, cloudlike formations. They assumed that these were nearby clouds of gases. But in the 1920’s, as larger, more powerful telescopes came into use, these “gases” were found to be something far more immense and significant: galaxies.\n\n5 A galaxy is a vast group of stars, gas and other material rotating around a central nucleus. Galaxies have been called island universes, for each one of them is in itself like a universe. For example, consider the galaxy we live in, which is called the Milky Way. Our solar system, that is the sun and the earth and other planets with their moons, is part of this galaxy. But it is only a very tiny part, for our Milky Way galaxy contains over 100 billion stars! Some scientists estimate at least 200 to 400 billion. And one science editor even stated: “There could be as many as five to ten trillion stars in the Milky Way galaxy.”2\n\n6 The diameter of our galaxy spans so vast a distance that if you could travel as fast as the speed of light (186,282 miles a second) it would take you 100,000 years to cross it! How many miles is that? Well, since light travels about six trillion (6,000,000,000,000) miles in a year, multiply that by 100,000 and you have the answer: our Milky Way galaxy is about 600 quadrillion (600,000,000,000,000,000) miles in diameter! The average distance between stars within the galaxy is said to be about six light-years, or about 36 trillion miles.\n\n7 It is almost impossible for the human mind to comprehend such size and distance. And yet, our galaxy is just the beginning of what is in outer space! There is something even more staggering. It is this: So many galaxies have now been detected that it has been said they “are as common as blades of grass in a meadow.”3 About ten billion galaxies are in the observable universe! But there are many more beyond the range of today’s telescopes. Some astronomers estimate that there are 100 billion galaxies in the universe! And each galaxy may contain hundreds of billions of stars! I don't think there's an end in sight.
1130599
The planets in this solar system are in stable orbits and get no farther away from each other than their orbits allow.\n\nYou are thinking of things like galaxies moving away from eachother, indicating that the universe is expanding.\n\nFirst off, to correct a misconception, some galaxies are moving towards one another, for example, the Andromeda Galaxy, and our own galaxy the Milky Way. \n\nCertain galaxies also seem to be "clumping" together, traveling towards something called "the geat attractor".\n\nDistant galaxies and quasars seem to be moving away.\n\nTo answer your question, some speculate that the expansion of the universe will continue forever and that gravity will lose in the long run. Eventually clusters of matter will become so seperated from eachother that the possability of any productive interactions approaches zero and stars will eventually die, and their remnants will be spread to thin to form into new ones. The universe, will essentially be a cold, dark, corpse. This is called the "cold death" theory. Depressing isn't it?\n\nBut never fear! There are other theories out there! Perhaps the universe will eventually implode into a big crunch, and the force of this implosion will create a new universe! Scientists aren't yet sure exactly how the universe will end. Hopefully none of us will be around to find out by example.
161169
We think so--up to a point.\n\nThere is something called the Hubble Shift--a change in the frequency of electromagnetic radiation that occurs due to the theorized expansion of the universe.  That boils down to things looking redder and redder the farther away they are.\n\nWhat's happening, as we currently understand it, is that we're seeing the light that was emitted however many years ago, that has taken that long to get here.  The trip may have caused some minor changes in the image, but the prevailing belief right now is that other than a little distortion (like from the Hubble effect, and gravitational lensing, and interacting with the dust and stuff between here and there) it's what it looked like then.
1091211
not for billions of years. And actually there will be almost no impact on either galaxy, other than one of them, or both, being mis-shapen by one another's gravity pull. Actually it is possible for galaxies to collide and not have one star hit another because galaxies are mostly empty space believe it or not. But the person above is also right, the gravitational tug on eachother could spark new star forming regions. even if we live that long, and say the sun is still around, meaning the planets are too, then our solar system will most likely not be affected. Also to add, the universe is expanding, but on the larger scale. Galaxies normally live in clusters and within clusters galaxies can collide and merge, but on the bigger scale the galaxy clusters are moving away from eachother.
407630
Very good.  You are close to the truth.\n\nSpace alternately expands and contracts over a two billion year cycle.\n\nWe are now nearing the end of the expansionary phase.  So all the scientists on primitive planets hypothesize a big bang and talk about red shift.\n\nIn the following phase, scientists on other primitive planets will hypotehsize a fiery, incandescent end in the middle of everything and talk a lot about blue shifts.\n\nThe reasons for this have to do with the benefits of dynamic equilibrium.  Static would not work.  Apparently God already knows about this, but so do some physicists.\n\nSoem Dutch guy named DeSitter was also close, I have heard.
874621
It could mean that it is moving faster and faster to the right or it could mean that it is moving slower and slower to the left. It could even mean that it is changing direction, changing from moving left to moving right.
762735
There have been a lot of questions about this recently, and as you stated, there are billions of galaxies out there.\nHow many we don't know.  But certainly enough that it isn't out of the question that a lifeform could evolve out there.  Not necessarily humanoid but a lifeform.  They may not look anything like humans or for that matter anything we got on earth.\nThe fact is, everything we know about living things is based on what we have available here on earth.\nThere is the possibility of a lifeform that doesn't require an oxygen based atmosphere.  \nWe are still in the infancy stage of development in space.  If the beings out there are advanced by say 10000 years and have the technology, they could already have been here and are monitoring us as we plod along.  Nobody knows for sure.\nAll we have are guesses and speculation.  No hard facts are available.
1032015
well we have alredy discovered them.  we know how many there are and hav pictures of many of them.  If you meen humans visiting these galaxies, we probaly would not even if we were on earth for 1 million more years.  It is possible but would take many generations to go to the nearest galaxie, because there is a cap on how fast it is possible to go.
890850
Yes, our galaxy (and the local group) is generally heading in the direction of the virgo cluster of galaxies. All together, we are moving in the direction of a much larger structure called the 'Great Attractor' that is in the direction of the constallation of Centaurus. I'm guessing that this is what you heard about.\n\nhttp://en.wikipedia.org/wiki/Great_Attractor
670386
Count it's rings.\n\nSeriously, it's very difficult to know for absolute sure.  BUt recently scientists..cosmologists to be more precise...believe they are 95% certain of this...\n\n"In a study published today in the journal Science, a team of researchers says the universe is between 11.2 billion and 20 billion years old."\n\n"The new calculations, by Lawrence Krauss of Case Western Reserve University and Brian Chaboyer at Dartmouth College, involved new information about old star clusters in our galaxy and a better understanding of how stars evolve. It was based on when stars are thought to end the main sequence of their lives, a point at which they've used up the hydrogen that fuels thermonuclear fusion and therefore begin to dim."
521083
Yes, it's going pretty fast! When you think that 150 years ago there were no cars or airplanes. Pretty freaky.\nNothing moved this fast in the past 1,500 years.\nAlso, going off on a tangent a bit... Did you know that 90% of all the extinct creatures that we know about (including all the dinosaurs) have become extinct in the past 150 years!\nMaybe it's all going too fast.
465735
The Universe is Expanding because it has been observed that the galaxies within the Universe are moving away from us at tremendouse speeds. The Doppler Effect explains the red shift observed through hundreds of telescopes which confirms the fact that the galaxies are moving away from us. If the Universe were not expanding, then the Galaxies would not be all moving away from us, but moving with us. The more perplexing question is if the Universe is expanding, then it is expanding into what?
13356
Some distant galaxies appear to be accelerating away from us, not just moving at a uniform speed. \n\nAnd the most distant galaxies are probably expanding away from us at more than the speed of light. This does not violate the special theory since no information is being transferred (see reference).
1180672
"Active" just means that you have been there, in the last 24 hours, in the last 3 days, in the last week, whatever the message says.  It doesn't necessarily mean that you have sent or gotten any messages or anything.  (Or that whoever profile you are looking at has done that, either!  Just that they have been there in that amount of time.) Hope this helps! :)
1002802
No, as some things are expanding faster than we are.