Astronomy Chapter 25 Vocab- "Galaxies and Dark Matter"

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5 Terms

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Sagittarius streams

two enormous “death spirals” that show large amounts of stars torn from neighbors

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Sloan Digital Sky Survey

a survey that is being done by a dedicated telescope situated in New Mexico; its purpose is to measure hundreds of millions of celestial objects, in the visible and near-infrared wavelengths

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superclusters

larger groupings of galaxy clusters

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gravitational lensing

a process that is predicted by the General Relativity Theory; instead of light from a source traveling in a straight line, it is bent by the presence of a massive body

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Einstein Ring

a special case of gravitational lensing, caused by the exact alignment of the source, lens, and observer