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Off Origional

Off Origional

Our Glaxy Information and Origion

Galaxy Origins

On a clear night with no moon, a hazy, luminous band stretches across the sky. The ancients devised many fantastic myths to account for this, "milky". Galileo was the first to observe with a telescope haze and discover that it was composed of countless faint stars. Today, we realize that this band nebula is our view from the inside of a large disk which is home to billions of stars, including our Sun, and a large amount of interstellar dust. This is our galaxy - the Milky Way.

In the early 20th century, astronomer Edwin Hubble's observations led to the discovery that ours is just one of the many billions of galaxies that populate the universe, every home galaxy billions of stars. Some, like the Milky Way, are flat disks with spiral arms and arch regions of dense interstellar gas called nebulae, which are active sites of star formation. However, others are agglomerations in the form of an ellipse of mature stars, virtually devoid of interstellar gas or dust.

Galaxies are not scattered randomly throughout the universe, but are often found in clusters, which are in turn in parts of larger groupings called "super-clusters". How are the structures of the universe happened? The materials that make up galaxies meet in the first place, giving birth to stars, or stars form first, bowing to the others to form galaxies?

Astronomers in the second half of the 20th century have made discoveries, expanding our understanding of the Universe, and our vision beyond the visible portion of the electromagnetic spectrum. The knowledge of mankind how the universe was born and how its phenomena arise many has grown exponentially in a period equivalent to a single life human. However, despite these great strides, some fundamental questions remain unanswered, chief among them, how the first galaxies form?

As much as archaeologists do, astronomers must peel off the layers of time to unearth clues to the birth of galaxies. As larger telescopes are built to observe distant galaxies weaker and more, we can investigate further in time. In recent years, astronomers have made great strides, looking farther into space to study objects that existed when the universe was very young. But nobody has yet seen a time when galaxies did not exist. To So we need to look back to a time when the universe was only a few hundred million years - and observe nascent galaxies.

The Big Bang Theory

The Big Bang was the primeval explosion that took all the space and time, all matter and energy into existence. To hundreds of thousands of years immediately after the universe was very hot and only consisted of a mixture of subatomic particles and radiation. As the universe cooled to the point that the matter became transparent to radiation, the first hydrogen and helium atoms began to form. Images taken by the Wilkinson Microwave Anisoptry Probe (WMAP) and other satellites indicate that the sea of features of particle and cosmic radiation and showed the first signs of the structure. It was these subtle variations in an otherwise smooth universe of seeds that formed the first galaxies? We do not know, and now we can only make the hypothesis.

Some astronomers believe the universe was built with small parts, such as gas clouds and star clusters, which merged with the time to form galaxies and galaxy clusters. Others theorize that the early universe first broke colossal groups containing building materials sufficient to making structures of the grandest scale - great walls and sheets of millions of galaxies - that increasingly fragmented into small gas clouds, resulting in galaxies individual.

The answers to these questions remain tantalizingly out of reach, so the mystery remains. Astronomers would like to understand how fluctuations density in a sea of subatomic particles could have formed the great variety of sizes and shapes of galaxies that make up the universe as we see today. And understanding galaxy evolution is needed to address more fundamental questions about the expansion of space and the ultimate fate of the universe.

Astronomers using NRAO telescopes observe galaxies in their early formative stages, as they were 10 million years, and establish the history of star formation in nearby galaxies distant, without the uncertainties caused by dust extinction.

Prof. (Dr.) Ashiq Hussain

About the Author

Dr. Ashiq belongs to Bhalessa area of District Doda of Jammu and Kashmir state and is presently working as assistant professor in Chemistry and can be reached at drashiqhussain@rediffmail.com