https://www.dlr.de/en/research-and-transfer/featured-topics/reusable-space-transportation/model-reusable-rocket-stage-travels-seven-times-the-speed-of-sound-in-hypersonic-wind-tunnel
This picture shows a reusable rocket stage model re-entering Earth's atmosphere at seven times the speed of sound, in the hypersonic wind tunnel in Cologne...
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https://hackernoon.com/new-material-design-approach-could-change-how-sound-moves-through-space
Mar 23, 2025 - Discover an inertia-augmented micromorphic model that enhances wave propagation in metamaterials, enabling negative refraction and improved acoustic control.
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