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What is a Galaxy and, how many different kinds are there

What is a Galaxy and, how many different kinds are there. Joson Anjo C. Casillan VII- Amorsolo. What is a galaxy. Massive Gravitationally bound Stars Stellar remnants Dust and dark matter. Stellar Remnants. White dwarfs Neutron stars Other exotic dense stars Black holes.

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What is a Galaxy and, how many different kinds are there

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  1. What is a Galaxy and, how many different kinds are there JosonAnjo C. Casillan VII- Amorsolo

  2. What is a galaxy • Massive • Gravitationally bound • Stars • Stellar remnants • Dust and dark matter

  3. Stellar Remnants • White dwarfs • Neutron stars • Other exotic dense stars • Black holes

  4. Stellar evolution • The cycle of stars • Stellar evolution is the process by which a star undergoes a sequence of radical changes during its lifetime.

  5. How many different kinds of galaxy are there • Elliptical • Spiral • Barred spiral • Irregular • Peculiar

  6. Elliptical • An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless brightness profile.

  7. Spiral • Spiral galaxies consist of a flat, rotating disc containing stars, gas and dust, and a central concentration of stars known as the bulge. These are surrounded by a much fainter halo of stars, many of which reside in globular clusters.

  8. Barred spiral • A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars. Bars are found in approximately two-thirds of all spiral galaxies.

  9. Irregular • An irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy.

  10. Peculiar • A peculiar galaxy is a galaxy which is unusual in its size, shape, or composition.

  11. References • http://www.apodnasa.gov • http://www.newscientist.com • http://ibp.fieldofscience.com • http://en.wikipedia.com

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