Galaxies

Perhaps you mean "thought to be"? - It is believed that all, or most, galaxies have a supermassive black hole at their center.

Each element has a characteristic "fingerprint", that can be noticed in the light that comes from a star, or galaxy. When the light is separated into its component, you see a so-called "spectrum"; specific elements have lines at specific position on such a spectrum. This can give at least a qualitative analysis; a quantitive analysis (the exact amounts) is trickier, but it can at least be estimated.

An irregular galaxy is a galaxy that doesn't have a specific shape like a pinwheel or an elliptical galaxy.

Actor Reg E. Cathey narrated National Geographic's "Inside The Milky Way".

Stars form in all parts of our galaxy - not just the "arms". Stars do indeed form in the central bulge. The vast majority of hot, young, blue stars are formed in the arms, but stars also form in the central bulge as well.

The Milky Way is a spiral galaxy, more specifically a "barred spiral galaxy" in which some stars are located in a horizontal band across the nucleus, rather than in the spiral arms.

Those are the spiral galaxies. In our "immediate neighborhood" (part of our Local Group), we have M31, a.k.a. the Andromeda Galaxy.

The inner parts of the galaxy rotate faster than the outer parts. No structure that big could maintain itself with that type of forces - it would simply break apart.

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 galaxy
The 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 galaxy

The 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 morphologies

Hoag'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 galaxy
Despite 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

Yes, the Earth is in the Milky Way. Every star you can see in the sky at night is also in the Milky Way. With the naked eye, you cannot see any stars that are not in the Milky Way. The next nearest galaxy is Andromeda and it is just about visible with the naked eye, looking like a hazy dust in the sky, but you would not see any stars in it. It is the furthest thing away that we can see with the naked eye. It is hard to be accurate but it is about 2,500,000 light years away. That is about 14,674,284,000,000,000,000 miles away. To see stars in it, you'd need a very powerful telescope.

> http://www.myfordfocus.com/how-to/antenna.htm < OR; If you're just looking to replace the antenna rod itself - It is just screwed into the base. I have a 02 wagon, and have taken it off a couple of times. You might have to tighten it a bit first to break the seal. then grap it good an unscrew it. It seems to stick, but comes off. Good luck

A light year is a unit of length: the distance light travels in one year, equal to about 9.461 x 1015 meters. It's used in astronomy to describe objects that are far enough away to be counted in light years, which is basically most things outside our immediate solar system.

well super Mario galaxy 1 doesnt have Yoshi and super Mario galaxy 2 does.super Mario galaxy 2 has an icon for rossalina when you get 240 stars. super Mario galaxy 2 has coment medals which you get in the gane in all the galaxys super Mario galxy 1 you can play as Mario and lugi but in order to play as lugi you have to get 120 stars as Mario and in super Mario galaxy 2 you can play as luigi after you beat tall trunk galaky.

The PW4000 is made up of modules or build groups and 3 major assemblies.

Build groups/Modules-LPC, Fan Case, HPC, Diffuser/Combustor, Turbine Nozzle, HPT,LPT and Turbine exhaust case

Major Assemblies- Nose cone, Fan blades and LPC/LPT coupling.

It means the galaxy has the shape of a spiral. To see what this looks like, search Google Images (image.google.com) for examples.

The name of the our galaxy is the Milkey Way. It is considered to have a elliptical shape because of how it is up in space.

galaxies are in every direction in space there in clusters and super clusters

Dark matter may be invisible to light, but it can still be detected, through its gravitational interactions. Specifically, it can be detected:

* By the fact that galaxies rotate way too fast, for the amount of known matter.

* By gravitational lensing.

Days and nights would be twice as long.

Actually, most galaxies are all moving away from all other galaxies, not just from ours. The exception is the Andromeda galaxy, with which the Milky Way is on a collision course.

At night.

Once it's dark enough, it really doesn't matter; as long as you are north of about 30N, it'll be visible all night.

One problem; the stars in Ursa Minor are all fairly dim. If you are in or near a city, it will be VERY difficult to see. Try going out into the country away from the city lights.

There are three main types: spiral, elliptical and irregular.