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Galaxies and galaxy clusters.

A galaxy is an assembly of billions of stars. The mass of an average galaxy is an order of magnitude greater than a hundred million solar masses. Galaxies interact with their neighbors and these interactions modify their shapes. Two or more galaxies can sometimes merge. Galaxies are of three types: elliptical, spiral, irregular.

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What Is a Galaxy? Journey to the Land of Billions of Stars

Galaxies from the Depths: Light from the Primordial Universe

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Beyond Our Senses!

Future Collision of Our Galaxy with the Sagittarius Galaxy

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The mystery of gamma bursts

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The Cigar Galaxy: A Smoke of Stars in the Night

The Hubble Sequence: The Secret Code of Galactic Shapes

Dance of the Stars: The Arms of the Milky Way

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Ancient Galaxies and Cosmic Evolution: A Deep Look Back in Time

Quasars: Beacons of the Distant Cosmos

Sagittarius A black hole at the center of our Galaxy

MOND Theory and Dark Matter: Why MOND Fails in Cluster Collisions

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NGC 1672: A Barred Spiral Galaxy in Full Activity

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