ASTRON 2B03 Lecture Notes - Caesium, Active Galactic Nucleus, Gamma Ray
25 Sep 2013
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Document Summary
Everything in special relatively comes from the idea that nothing can travel faster than c. Main concept of last time raisin bread shit. Visible light is a tiny portion of all electromagnetic radiation in the universe. Reason why uv light is damaging is because it is high energy. Not expected to know the slide that has the vertical spectrum. Gamma ray bursts first detected by cold war. Nuclear bomb also gives off high energy gamma rays. Soviets were pissed that americans were testing, but it was really an astronomical event. Things that emit x rays are hot gas, agn (active galactic nuclei) x ray coming from the centre of galaxies, they are associated w/ black holes. Infrared we detect stuff with dust in the universe. We use all different cameras for all the spectrum wavelengths. Atomic (neutral) hydrogen dominates the universe, but we cant normally see it.
