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Spiral galaxy UPSC NOTE

 Why in news

  • The universe is about 13.8 billion years old and is home to different kinds of galaxies, from spiral to elliptical and those with or without bulges. 

  • Astronomers previously believed spiral galaxies formed about 6 billion years ago, but a new study by a group of astronomers from the University of Missouri in the U.S. has called this belief into question

  • The study has revealed more spiral galaxies in the universe’s youth than astronomers had expected.

Spiral galaxy

  • Spiral galaxies are twisted collections of stars and gas that often have beautiful shapes and are made up of hot, young stars. 

  • Most of the galaxies (approximately 60% of all galaxies) that scientists have discovered so far are spiral galaxies, as opposed to the other two main categories of galaxy shapes—elliptical and irregular.

  • The Milky Way, the galaxy that includes Earth and our solar system, is an example of a spiral galaxy.

  • Most spiral galaxies contain a central bulge surrounded by a flat, rotating disk of stars. 

  • The bulge in the center is made up of older, dimmer stars and is thought to contain a supermassive black hole

  • Approximately two-thirds of spiral galaxies also contain a bar structure through their center, as does the Milky Way (barred spiral galaxy)

  • The disk of stars orbiting the bulge separates into arms that circle the galaxy.

  • Spiral galaxies are thought to evolve into elliptical galaxies as the spirals get older.



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Learnerz IAS | Concept oriented UPSC Classes in Malayalam: Spiral galaxy UPSC NOTE
Spiral galaxy UPSC NOTE
Learnerz IAS | Concept oriented UPSC Classes in Malayalam
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