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How would other galaxies appear to move relative to Earth if the universe were shrinking?
Wiki User
∙ 7y ago
If the Universe was shrinking the galaxies would appear to be moving towards the Earth, and look more blue than they should. This is the opposite to the universe expanding where galaxies would appear to be moving away from the Earth, which we know due to "red shift". Andromeda would be the exception since it's directly moving towards the Milky Way.
Wiki User
∙ 7y ago
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According to Hubble's law what do the farthest galaxies in the universe appear to be doing?
Receding from each other faster the farther away they are. He saw they were "red shifted" and the red shift was greater the farther away the galaxy was. This mean that the Universe is expanding.
What are similarities between elliptical and spiral galaxies?
While spiral galaxies are bright, elliptical galaxies are dim. Spiral galaxies are hotbeds of star formation, but elliptical galaxies aren't nearly as prolific because they contain less gas and dust, which means fewer new (and brighter) stars are born
Where is the fixed point in the universe?
There do not appear to be ANY "fixed points" in the Universe. Everything is in motion, and there is no "preferred" frame of reference.
How do scientists use Doppler shift to support the big bang theory?
It is called The Big Bang Theory, actually. Doppler shift shows that galaxies are moving away from each other at rates that depend on how far apart they are. According to the Big Bang Theory, the universe began with an enormous explosion. Then, the entire universe began to expand everywhere at the same time.
What is the order in decreasing size of spiral giant elliptical dwarf elliptical and irregular galaxies?
Galaxies come in three main types: ellipticals, spirals, and irregulars. A slightly more extensive description of galaxy types based on their appearance is given by the Hubble sequence. Since the Hubble sequence is entirely based upon visual morphological type, it may miss certain important characteristics of galaxies such as star formation rate (in starburst galaxies) and activity in the core (in active galaxies).Elliptical galaxyThe Hubble classification system rates elliptical galaxies on the basis of their ellipticity, ranging from E0, being nearly spherical, up to E7, which is highly elongated. These galaxies have an ellipsoidal profile, giving them an elliptical appearance regardless of the viewing angle. Their appearance shows little structure and they typically have relatively little interstellar matter. Consequently these galaxies also have a low portion of open clusters and a reduced rate of new star formation. Instead the galaxy is dominated by generally older, more evolved stars that are orbiting the common center of gravity in random directions. In this sense they have some similarity to the much smaller globular clusters.The largest galaxies are giant ellipticals. Many elliptical galaxies are believed to form due to the interaction of galaxies, resulting in a collision and merger. They can grow to enormous sizes (compared to spiral galaxies, for example), and giant elliptical galaxies are often found near the core of large galaxy clusters.Starburst galaxies are the result of such a galactic collision that can result in the formation of an elliptical galaxy.Spiral galaxy and Barred spiral galaxyThe Sombrero Galaxy, an example of an unbarred spiral galaxy. Credit:Hubble Space Telescope/NASA/ESA.Spiral galaxies consist of a rotating disk of stars and interstellar medium, along with a central bulge of generally older stars. Extending outward from the bulge are relatively bright arms. In the Hubble classification scheme, spiral galaxies are listed as type S, followed by a letter (a, b, or c) that indicates the degree of tightness of the spiral arms and the size of the central bulge. An Sa galaxy has tightly wound, poorly-defined arms and possesses a relatively large core region. At the other extreme, an Sc galaxy has open, well-defined arms and a small core region.In spiral galaxies, the spiral arms have the shape of approximate logarithmic spirals, a pattern that can be theoretically shown to result from a disturbance in a uniformly rotating mass of stars. Like the stars, the spiral arms also rotate around the center, but they do so with constant angular velocity. That means that stars pass in and out of spiral arms, with stars near the galactic core orbiting faster than the arms are moving while stars near the outer parts of the galaxy typically orbit more slowly than the arms. The spiral arms are thought to be areas of high density matter, or "density waves". As stars move through an arm, the space velocity of each stellar system is modified by the gravitational force of the higher density. (The velocity returns to normal after the stars depart on the other side of the arm.) This effect is akin to a "wave" of slowdowns moving along a highway full of moving cars. The arms are visible because the high density facilitates star formation, and therefore they harbor many bright and young stars.NGC 1300, an example of a barred spiral galaxy. Credit:Hubble Space Telescope/NASA/ESA.A majority of spiral galaxies have a linear, bar-shaped band of stars that extends outward to either side of the core, then merges into the spiral arm structure. In the Hubble classification scheme, these are designated by an SB, followed by a lower-case letter (a, b or c) that indicates the form of the spiral arms (in the same manner as the categorization of normal spiral galaxies). Bars are thought to be temporary structures that can occur as a result of a density wave radiating outward from the core, or else due to a tidal interaction with another galaxy. Many barred spiral galaxies are active, possibly as a result of gas being channeled into the core along the arms.Our own galaxy is a large disk-shaped barred-spiral galaxy about 30 kiloparsecs in diameter and a kiloparsec in thickness. It contains about two hundred billion (2×1011) stars and has a total mass of about six hundred billion (6×1011) times the mass of the Sun.Other morphologiesHoag's Object, an example of a ring galaxy. Credit:Hubble Space Telescope/NASA/ESA.Peculiar galaxies are galactic formations that develop unusual properties due to tidal interactions with other galaxies. An example of this is the ring galaxy, which possesses a ring-like structure of stars and interstellar medium surrounding a bare core. A ring galaxy is thought to occur when a smaller galaxy passes through the core of a spiral galaxy. Such an event may have affected the Andromeda Galaxy, as it displays a multi-ring-like structure when viewed in infrared radiation.A lenticular galaxy is an intermediate form that has properties of both elliptical and spiral galaxies. These are categorized as Hubble type S0, and they possess ill-defined spiral arms with an elliptical halo of stars. (Barred lenticular galaxies receive Hubble classification SB0.)NGC 5866, an example of a lenticular galaxy. Credit:Hubble Space Telescope/NASA/ESAIn addition to the classifications mentioned above, there are a number of galaxies that can not be readily classified into an elliptical or spiral morphology. These are categorized as irregular galaxies. An Irr-I galaxy has some structure but does not align cleanly with the Hubble classification scheme. Irr-II galaxies do not possess any structure that resembles a Hubble classification, and may have been disrupted. Nearby examples of (dwarf) irregular galaxies include the Magellanic Clouds.Dwarf galaxyDespite the prominence of large elliptical and spiral galaxies, most galaxies in the universe appear to be dwarf galaxies. These tiny galaxies are about one hundredth the size of the Milky Way, containing only a few billion stars. Ultra-compact dwarf galaxies have recently been discovered that are only 100 parsecs across.Many dwarf galaxies may orbit a single larger galaxy; the Milky Way has at least a dozen such satellites, with an estimated 300-500 yet to be discovered. Dwarf galaxies may also be classified as elliptical, spiral, or irregular. Since small dwarf ellipticals bear little resemblance to large ellipticals, they are often called dwarf spheroidal galaxies instead
What info has Hubble contributed astronomy?
He gave the idea that the universe is expanding, which has a lot of supporting data currently. The galaxies in the universe appear to be moving away from each other.
What has the Hubble telescope contributed to our knowledge of astronomy?
== it gave the idea that the universe is expanding, which has a lot of supporting data currently. The galaxies in the universe appear to be moving away from each other.==
What do the farthest galaxies in the universe appear to be doing according to Hubble's law?
Mating. If you even know what Hubble's Law is you know the answer to this question.
What is the movement direction of earth?
Relative to its own axis, it spins in a counter-clockwise direction when viewed from its North Pole. Relative to the Moon, they maintain a fixed orbit around each other at a slowly increasing distance (centimeters per year). The same face of moon is always visible from the Earth. Relative to the Sun, it moves in a counter-clockwise direction on an elliptical orbit, when viewed from its North Pole. Relative to the center of the Milky Way galaxy it moves in a counter-clockwise direction along with all the other stars and planets, again when viewed from its North Pole. Relative to the Universe, the Galaxies all appear to be moving away from each other. At least in our cluster of galaxies, or even our observable part of the universe.
Why do some galaxies look red when they should be white?
As the universe expands these galaxies are moving away from us. The light waves they give off appear stretched out which means they have a longer wavelength. Wavelength relates to the colour of light and the longer the wavelength the closer to red it looks.
According to Hubble's law what do the farthest galaxies in the universe appear to be doing?
Receding from each other faster the farther away they are. He saw they were "red shifted" and the red shift was greater the farther away the galaxy was. This mean that the Universe is expanding.
Are there galaxies with no supermassive black holes?
Yes. Some galaxies, particularly irregular galaxies, appear to lack supermassive black holes.
Are there planets inside of galaxies?
Yes. Our own solar system is part of the Milky Way galaxy. Thousands of other systems with planets have been discovered in our galaxy. The number of planets in our galaxy alone prbably numbers in the billions.
What is the relationship between the expanding universe and the distances between stars and galaxies?
This is mostly theory, Galaxies are made of billions of stars. For some reason Galaxy's hold on to their stars. We do not really understand how galaxy's can yet hold their form like this. Our math so far has trouble with making sense of this. When comparing one galaxy to another, size becomes so large words are hard to describe the distance of space. There is an an incredible amount of space between everything out there. What is the distance between galaxies, why is it there, The expanding universe is trying to explain the growing spaces between galaxies yet the galaxies appear to stay bound to themselves.
What are similarities between elliptical and spiral galaxies?
While spiral galaxies are bright, elliptical galaxies are dim. Spiral galaxies are hotbeds of star formation, but elliptical galaxies aren't nearly as prolific because they contain less gas and dust, which means fewer new (and brighter) stars are born
Is a local cluster bigger than a galaxy?
Yes. In astronomy, the phrase "local cluster" refers to the "local cluster of galaxies that are fairly near us". Scientists may never know exactly why the big bang and the formation of the universe seems to have been so spotty, but there appear to be random patterns of galaxies, dust clouds and empty space. If the Universe were a piece of cloth, it would be lace.
Is there a place in the universe that is so distant from stars or other celestial bodies that if one were to be placed there one would see nothing but blackness?
If there is then we, being right beside a star, cannot know of it. We appear to be surrounded by stars and galaxies.
