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This resource covers Seyfert galaxies, radio galaxies, BL Lacertae (BL Lac) objects, quasars, supermassive black holes, determining masses in galactic centers using the virial theorem, and a model for active galactic...
This activity introduces two different representations of spectra: the photographic representation, such as the rainbow, and the graphical representation used more often by astronomers. A rainbow is often given as an...
In this activity, learners will look at some of the characteristic properties of aftershock sequences, and relate them to variables in two equations: the modified version of Omori's Law, and the Gutenberg-Richter...
This is the homepage of Alaska's geological and geophysical survey, the agency responsible for collecting and distributing information about the state's geologic resources and hazards. Materials include numerous...
This site explains why three percent is a fundamental limit of X-ray detectors that use the conventional method of conversion to electric charges, and if a higher spectral resolution is required astronomers have to...
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