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A NASA/ESA Hubble Space Telescope (HST) view of the magnificent spiral galaxy NGC 4603, the most distant galaxy in which a special class of pulsating stars called Cepheid variables have been found. It is associated with the Centaurus cluster, one of the most massive assemblages of galaxies in the nearby universe.

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This diagram shows our cosmic address at a glance. We see our planetary system around the Sun, our stellar neighborhood in our galaxy, our galaxy in the local group of galaxies, and our group in the entire universe.

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There could be as many as 100 to 200 billion galaxies in the observable universe. Here are some of the most fascinating.

There could be as many as 100 to 200 billion galaxies in the observable universe. Here are some of the most fascinating.

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Large number of dwarf galaxies discovered in the early universe UNIVERSITY OF CALIFORNIA RIVERSIDE 11/25/16 Astronomy Now Massive cluster of galaxies Abell 1689 creates a strong gravitational effect on background and older galaxies, bending and distorting their images into arcs of light: NASA, ESA, B. Siana, and A. Alavi.

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Located approximately 300 million light-years away in the constellation of Volans, AM 0644-741 is one of the most spectacular ‘Ring Galaxies’ we currently know. - Image Credit: NASA, ESA, and The Hubble Heritage Team (AURA/STScI)

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