S-wave
In space and astronautical engineering, S-wave refers to the secondary wave or shear wave that travels through the interior of a planet or other celestial body. S-waves are transverse waves, meaning that the oscillations are perpendicular to the direction of wave propagation. They are slower than primary waves (P-waves) but can travel through solid materials, whereas P-waves can travel through both solid and liquid materials. The study of S-waves is important in seismology and planetary science, as they provide information about the internal structure and composition of celestial bodies. S-waves can also be used to detect and locate earthquakes and other seismic events on Earth and other planets.
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