Friday, October 1, 2010

Elliptical Galaxies

An elliptical galaxy is a galaxy with a smooth, elliptical shape. It is also called an "E" or "E-type" galaxy. The stars found in Elliptical Galaxies are often very old. This is because elliptical galaxies don't actively create new stars. The only stars found with in them were created along time ago.
Although they are usually smaller, they can vary in size. Most have only a few thousand stars, but some can have billions of stars. The largest galaxies are giant ellipticals. Many elliptical galaxies are believed to form due to the interaction of galaxies, resulting in a collision and merger. They can grow to enormous sizes (compared to spiral galaxies, for example), and giant elliptical galaxies are often found near the core of large galaxy clusters

The stars in an elliptical galaxy are often very close together making the center look like one giant star. If the Earth were inside an elliptical galaxy it would be bright both day and night.
Unlike spiral galaxies, elliptical galaxies are generally yellow-red in color, do not have spiral arms, and contain little interstellar dust or gas. They are generally found in rich clusters of galaxies.

M87 and M32 are examples of elliptical galaxies

M87

M32

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