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

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A planetary scientist has used careful mathematical calculations to determine the density of Mercury's crust, which is thinner than anyone thought.

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Scientists have examined a slice from a meteorite that contains large diamonds formed at high pressure. The study shows that the parent body from which the meteorite came was a planetary embryo of a size between Mercury and Mars.

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Theoretical physicists used simulations to explain the unusual readings collected in 2009 by the Mercury Surface, Space Environment, Geochemistry, and Ranging mission. The origin of energetic electrons detected in Mercury's magnetic tail has puzzled scientists. This new study provides a possible solution to how these energetic electrons form.

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Legendary explorers and visionaries, real and fictitious, are among those immortalized by the IAU in the first set of official surface-feature names for Pluto's largest moon, Charon.

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Chemical models developed to help limit the emission of pollutants by car engines are being used to study the atmospheres of hot exoplanets orbiting close to their stars.

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Project Mercury proved that humans could live and work in space, paving the way for all future human exploration.

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A hot, metallic, Earth-sized planet with a density similar to Mercury -- situated 339 light years away -- has been detected and characterized by a global team of astronomers.

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Three billion miles away on the farthest known major planet in our solar system, an ominous, dark storm -- once big enough to stretch across the Atlantic Ocean from Boston to Portugal -- is shrinking out of existence as seen in pictures of Neptune taken by NASA's Hubble Space Telescope.

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Building a submarine gets tricky when the temperature drops to -300 Fahrenheit and the ocean is made of methane and ethane. Researchers are working to determine how a submarine might work on Titan, the largest of Saturn's many moons and the second largest in the solar system. The space agency plans to launch a real submarine into Titan seas in the next 20 years.

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Scientists have provided the first experimental evidence for superionic conduction in water ice at planetary interior conditions, verifying a 30-year-old prediction.

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A planet can be no bigger than about 10 times the size of Jupiter, an astrophysicist has calculated.

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Like the waistband of a couch potato in midlife, the orbits of planets in our solar system are expanding. It happens because the Sun's gravitational grip gradually weakens as our star ages and loses mass. Now, scientists have indirectly measured this mass loss and other solar parameters by looking at changes in Mercury's orbit.

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Using the now-complete Cassini data set, astronomers have created a new global topographic map of Saturn's moon Titan that has opened new windows into understanding its liquid flows and terrain.

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The gas composition of a planet's atmosphere generally determines how much heat gets trapped in the atmosphere. For the dwarf planet Pluto, however, the predicted temperature based on the composition of its atmosphere was much higher than actual measurements taken by NASA's New Horizons spacecraft in 2015. A new study proposes a novel cooling mechanism controlled by haze particles to account for Pluto's frigid atmosphere.

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Forty years ago, the twin Voyagers spacecraft were launched to explore the frontiers of our solar system, and have since made countless discoveries, including finding magnetic bubbles around two of the outer planets.

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Jupiter's intense northern and southern lights pulse independently of each other according to new research.

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The trans-neptunian belt contains four dwarf planets, among which Haumea stands out for its extremely elongated shape and rapid rotation. A stellar occultation makes it possible to establish the main physical characteristics of this previously little known body -- among which most surprising was the presence of a ring.

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It might be lingering bashfully on the icy outer edges of our solar system, hiding in the dark, but subtly pulling strings behind the scenes: stretching out the orbits of distant bodies, perhaps even tilting the entire solar system to one side. It is a possible "Planet Nine" -- a world perhaps 10 times the mass of Earth and 20 times farther from the sun than Neptune.

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Researchers used historic accounts of a rare red aurora over Kyoto, Japan, in the 18th century to support calculations of the strength of the associated magnetic storm. The September 1770 storm could be 3-10% stronger than the September 1859 storm, the greatest storm in the past 200 years. The research provides insights that could assist preparation for an unlikely, but possible, future intense magnetic storm.

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Mercury, our smallest planetary neighbor, has very little to call an atmosphere, but it does have a strange weather pattern: morning micro-meteor showers.