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Galaxies in the Early Universe

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Astronomers in the past decade have detected thousands of galaxies dating from epochs only a few billion years after the big bang. Many of them, discovered in deep optical and near-infrar...

How Disc Galaxies Work

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Disc galaxies like our own Milky Way, characterized by a flattened disc of stars and gas (often with a central bulge of material as well) have a wide range of masses, spatial extents, and...

Gravitational Microlens Detection from Spitzer

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The path of light from a star as it passes by a massive body, like an exoplanet, will be bent and an observer looking towards the star will see its image distorted. Like an object seen t...

What Powers the Most Luminous Galaxies?

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Galaxy-galaxy interactions have long been known to influence galaxy evolution. They are commonplace events, and a large majority of galaxies show signs of interactions, including tidal t...

A Cluster of X-Ray Binary Stars Near the Galaxy's Center

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A binary star system is one that contains a pair of stars orbiting each other. A black hole X-ray binary is a binary system in which one of the stars is a black hole and the other is a n...
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