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Galaxy Zwicky-18

This galaxy was once to be thought to be a very young one, only 500 million years old. But indeed it is much older. In October 2007 some faint, old stars have been discovered there with the Hubble telescope. Although a relative short time ago there happaned a major starburst, which led to the observable high amount of bright, young stars.

Constellation: Ursa Major
Age: 10 billion years
Distance: 59 million light-years
Visual magnitude: 16
Number of Stars: 800 million
Diameter: 3 000 light-years
Type: Irr

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Foto: Y. Izotov (Main Astronomical Obs., Ukraine), T. Thuan (Univ. Virginia), ESA, NASA

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