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History of X-ray Astronomy
A brief overview of the history behind X-ray Astronomy: from the differences between optical and X-ray telescopes to descriptions of the major X-ray Astronomy missions.
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Discovering the X-ray universe - What the "X-ray universe" refers to, how this is studied and why it is important to scientific research.
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X-rays & Light - Discovered in 1895, X-rays are another form of light. Look at the electromagnetic spectrum, learn how X-rays are produced by hot gas & synchrotron radiation, and compare medical X-rays and X-ray Astronomy.
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X-ray Absorption - What happens when an X-ray is absorbed in the atmosphere? How do X-ray telescopes in orbit above the Earth's atmosphere collect X-rays?
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Galactic Navigation - Do you ever question, "Where are all those stars in the sky really located? How far are they from me?" Well then, take a tour of the Galactic Coordinate System.
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Dark Matter Mystery - Is it possible that most galaxies are surrounded by some "dark" form of matter that cannot be observed by radio, infrared, optical, ultraviolet, X-ray, or gamma-ray telescopes?
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