After Heaviside’s attempts to generalize Maxwell’s equations, Heaviside came to the conclusion that electromagnetic waves were not to be found as longitudinal waves in “free space” or homogeneous media. But Maxwell’s equations do lead to the appearance of longitudinal waves under some circumstances, for example, in plasma waves or guided waves. Basically distinct from the “free-space” waves, such as those studied by Hertz in his UHF experiments, are Zenneck waves. The longitudinal modes of a resonant cavity are the particular standing wave patterns formed by waves confined in a cavity. The longitudinal modes correspond to those wavelengths of the wave which are reinforced by constructive interference after many reflections from the cavity’s reflecting surfaces. Recently, Haifeng Wang et al. proposed a method that can generate a longitudinal electromagnetic (light) wave in free space, and this wave can propagate without divergence for a few wavelengths.
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The GRAIL mission determined the internal structure of the Moon in great detail for nine months during 2012. Armed with this the new information, GRAIL astronomers were able to redefine the sizes of the largest impact basins on the lunar surface. But there is an important difference. On our own planet, lakes and seas are flowing with water, while Titan's lakes and seas are filled primarily with methane and ethane, that slosh around within these liquid reservoirs. In this never-before-seen cycle, the hydrocarbon molecules evaporate and condense into clouds that send an exotic "rain of terror" back down to this strange moon-world's carbon-slashed surface. Popular culture has tried to extract maximum leverage out of the mysterious symbolism associated with the full moon. Modern fables have produced creatures like the were-wolf, an otherwise normal man who apparently becomes a wolf when the moon is full. A full moon has strong suggestions of pure and predominantly platonic, love.