The Hitchhiker's Guide to Elliptical GalaxiesLearn Science on mps-science.com. The Hitchhiker's Guide to Elliptical Galaxies article will help answer your questions on Science.We at mps-science.com specialize in Science. Science at mps-science.com provides the most up to date news and articles. If you have questions please do not hesitate to contact us.
Some disk galaxies without much structure can hardly be distinguished from elliptical galaxies and thus are sometimes misclassified. Elliptical galaxies are unlike spiral galaxies and hence unlike our own Milky Way Galaxy. Before hitchhiking to and through elliptical galaxies, one must first familiarize themselves with all the other types of galaxies. Spiral coils in space Spirals like our own galaxy, fall into several classes depending on their shape and the relative size of their bulge or how they curve. In the most popular current theory, galaxies in the local Universe are the result of a relatively slow process where small and less massive galaxies merge to gradually build up bigger and more massive galaxies. Article: Elliptical galaxies are ellipsoidal agglomerations of stars, which usually do not contain much interstellar matter, and look smoothly like small wads when viewed through a telescope. Some disk galaxies without much structure can hardly be distinguished from elliptical galaxies and thus are sometimes misclassified. Elliptical galaxies are unlike spiral galaxies and hence unlike our own Milky Way Galaxy. Ellipti-what? The most popularly used sifting out of galaxies is due to Hubble (1925) and akin to this categorization, there are two major groups: the spiral and elliptical galaxies, but there are also lenticulars and irregulars. Before hitchhiking to and through elliptical galaxies, one must first familiarize themselves with all the other types of galaxies. Spiral coils in space Spirals like our own galaxy, fall into several classes depending on their shape and the relative size of their vesicle or how they curve. Spiral galaxies are characterized by the presence of gas in the disk which means star formation remains take-over at the present time, hence the younger population of stars. Spirals are usually found in the low density galactic field where their delicate shape can obviate disruption by tidal forces from neighboring galaxies. The egg in space Ellipticals on the other hand are placed in sub categories depending on their degree of ellipticity. They have a uniform luminosity and are similar to the flying start in a spiral galaxy, but with no disk. The stars are old and there is no gas present. Ellipticals are usually found in the high density field, at the center of clusters. Irregular Lentils The last two other types of galaxies are titled Lenticular and Irregular. Lenticulars also possess both a swell out and a disk, but they have no spiral arms. There is little or no gas and so all the stars are old. They also barnstorm to be an intermediate. Irregulars on the other hand are small galaxies, with no wale and an ill-defined shape. Spots in the universe Galaxies are like islands in the Universe, made of stars as well as dust and gas clouds. They come in different sizes and shapes. Galaxies are not only distinct in shape, they also vary in size: some may be as 'light' as a stellar globular grove in our Milky Way (i.e. they contain close the equivalent of a few million Suns) while others may be more massive than a million Suns. Presently, more than half of the stars in the Universe are located in massive spheroidal galaxies. One of the main open questions of modern biophysics and cosmology is how and when galaxies formed and evolved starting from the primordial gas that filled the early Universe. In the most popular current theory, galaxies in the local Universe are the result of a relatively slow process where small and less massive galaxies merge to gradually mature up bigger and more massive galaxies. In this scenario, dubbed 'hierarchical merging', the young Universe was populated by small galaxies with little mass, whereas the present Universe contains large, old and massive galaxies, the very last to form in the final stage of a slow accumulation process. If this scenario were true, then one should not be able to find massive elliptical galaxies in the young universe. Or, in other words, due to the finite speed of light, there should be no such massive galaxies very far from us. And indeed, until now no old elliptical galaxy was known besides a radio-galaxy that was discovered all but ten years ago.
And so the mystery of the elliptical galaxy continues. Continue hitchhiking through galaxies to understand things metamorphosed and whatever happens, remember not to panic. |
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