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Categories: Physics: Acoustics and Ultrasound, Space: The Solar System

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Space scientists have discovered a never-before-seen mechanism fueling huge planetary aurorae at Saturn.

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Astronomers have identified two different cases of 'mini-Neptune' planets that are losing their puffy atmospheres and likely transforming into super-Earths.

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New space research has revealed a complex 'tug-of-war' lights up aurorae in Jupiter's upper atmosphere. The study describes the delicate current cycle driven by Jupiter’s rapid rotation and the release of sulphur and oxygen from volcanoes on its moon, Io.

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Using less material in floors is a viable strategy for improving sustainability in buildings, as it can reduce the structure's environmental footprint. Prioritizing only this goal, however, can lead to unwanted effects -- such as an echo in a room or noise traveling between floors, according to architectural engineers.

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Researchers studying a Martian meteorite have found the first evidence of high-intensity damage caused by asteroid impact, in findings that have implications for understanding when conditions suitable for life may have existed on early Mars.

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Scientists have demonstrated a technique for the recovery of weak, noise-dominated optical signals.

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An international team analyzed the atmosphere of one of the most extreme known planets in great detail. The results from this hot, Jupiter-like planet that was first characterized with the help of the CHEOPS space telescope, may help astronomers understand the complexities of many other exoplanets -- including Earth-like planets.

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Astronomers have presented a new explanation for the mysterious downward-moving dark voids seen in some solar flares.

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Through analysis of ice cores from Greenland and Antarctica, a research team has found evidence of an extreme solar storm that occurred about 9,200 years ago. What puzzles the researchers is that the storm took place during one of the sun's more quiet phases -- during which it is generally believed our planet is less exposed to such events.

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Scientists measured the properties of ice-brine mixtures as cold as -145 degrees Fahrenheit to help confirm that salty water likely exists between grains of ice or sediment under the ice cap at Mars' south pole. Laboratory measurements support oddly bright reflections detected by the MARSIS subsurface sounding radar aboard ESA's Mars Express orbiter.

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A technique that uses ultrasound images to determine the depth and shape of the hip socket can accurately predict which infants with hip dysplasia will develop normal hip structure and which remain dysplastic, according to a new study. Researchers said statistical shape modeling improves on existing techniques and could spare many infants from unnecessary treatment.

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Aerospace engineers have developed a way to use articulated solar panels to steer the satellite during aerobraking, reducing the number of passes needed, resulting in potential savings in propellant, time, and money.

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Liquid water previously detected under Mars' ice-covered south pole is probably just a dusty mirage, according to a new study of the Red Planet. The finding challenges a 2018 study that appeared to find liquid water under Mars' south polar cap.

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New research has confirmed the frequency of asteroid collisions that formed impact craters on Mars has been consistent over the past 600 million years.

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Brothers working in a lab discover that sound can be used to analyze the properties of laser-induced graphene in real time.

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A scientist recently set out to prove that the tiny, innermost moon of Saturn was a frozen inert satellite and instead discovered compelling evidence that Mimas has a liquid internal ocean. In the waning days of NASA's Cassini mission, the spacecraft identified a curious libration, or oscillation, in the moon's rotation, which often points to a geologically active body able to support an internal ocean.

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Researchers used the characteristics of owl wings to inform airfoil design and significantly reduce trailing-edge noise. The team used noise calculation and analysis software to conduct a series of detailed theoretical studies of simplified airfoils with characteristics reminiscent of owl wings. They applied their findings to suppress the noise of rotating machinery. Improving the flow conditions around the trailing edge and optimizing the shape of the edge suppressed the noise.

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NASA's Curiosity rover landed on Mars on Aug. 6, 2012, and since then has roamed Gale Crater taking samples and sending the results back home for researchers to interpret. Analysis of carbon isotopes in sediment samples taken from half a dozen exposed locations, including an exposed cliff, leave researchers with three plausible explanations for the carbon's origin -- cosmic dust, ultraviolet degradation of carbon dioxide, or ultraviolet degradation of biologically produced methane.

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Organic molecules found in a meteorite that hurtled to Earth from Mars were synthesized during interactions between water and rocks that occurred on the Red Planet about 4 billion years ago, according to new analysis.

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A new study reveals how the diminutive Moon could have been an occasional magnetic powerhouse early in its history, a question that has confounded researchers since NASA's Apollo program began in the 1960s.