Hierarchy Model of Galaxy formation

According to Hierarchy Model of Galaxy formation, most of the stars form in much smaller clouds, which later agglomerate together to form the galaxies we now observe. During 1970s and 1980s, it is realized that…

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Milky way Galaxy

stellar magnitude

Since we are a part of Milky way, it is difficult to construct an external view. However, through various methods, we have determined the size and shape of our galaxy, and our place in it….

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Galaxy general feature and evolution

A galaxy is a gravitational bound system that consists of stars and stellar remnants, an interstellar medium of gas and dust, and an important but poorly understood components called dark matter. A galaxy typically contains…

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Cosmic microwave background radiation

Cosmic microwave background radiation

With a traditional telescope, the space between stars and galaxies is completely dark. But a sufficiently sensitive radio telescope shows a faint background glow, almost exactly the same in all directions, not associated with any…

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Interstellar Medium

Interstellar Medium

The medium between the stars is called interstellar medium. It consists of extremely dilute mixture of gases (neutral, ionized etc) dusts, cosmic rays and magnetic fields. The chemical composition if interstellar medium is about 90%…

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