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

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Presentation transcript:

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

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

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

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

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.

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.

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

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

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