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Galaxies

Galaxies. The Milky Way Galaxy.  The Milky Way is shaped like a disk with a bulge in the center  You cannot see the center of the galaxy because it is hidden by dust  The disk of the Milky Way measures more than 100,000 light years in diameter. The Milky Way Galaxy.

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Galaxies

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  1. Galaxies

  2. The Milky Way Galaxy The Milky Way is shaped like a disk with a bulge in the center You cannot see the center of the galaxy because it is hidden by dust The disk of the Milky Way measures more than 100,000 light years in diameter

  3. The Milky Way Galaxy The Milky Way contains clouds of gas and dust called nebulae The galaxy is so large that the Sun takes about 250 million years to complete one orbit

  4. Types of Galaxies Spiral Galaxies Have arms of stars, gas, and dust that curve away from the center of the galaxy in a spiral pattern

  5. Types of Galaxies These galaxies are disk-shaped and have a central bulge Most of the stars in the disk and bulge are old stars – the dense arms within the disk contain many young, bright stars

  6. Types of Galaxies Elliptical Galaxies Shaped like spheres or eggs These galaxies have almost no dust or gas between stars, and all of their stars are old

  7. Types of Galaxies Irregular Galaxies Faint galaxies without a definite shape They are smaller than the other types of galaxies and have many fewer stars

  8. Types of Galaxies Galaxies sometimes collide with other galaxies – these collisions can cause changes in their shapes

  9. Center of Galaxies Most large galaxies seem to have supermassive blackholes at their centers Astronomers can identify the presence of a black hole by the behavior of matter around it

  10. Center of Galaxies The gravity of a supermassive black hole is so strong that it draws in a huge, whirlpool of gas from nearby stars The motions of stars orbiting the black hole can also reveal its presence

  11. Center of Galaxies The very bright centers of some distant galaxies are called quasars – the galaxy surrounding a quasar is often hard to see because the quasar is so much brighter than it

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