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Categories: Physics: Acoustics and Ultrasound, Space: The Solar System
Published Solving the mystery of Pluto's giant blades of ice


NASA's New Horizons mission revolutionized our knowledge of Pluto when it flew past that distant world in July 2015. Among its many discoveries were images of strange formations resembling giant knife blades of ice, whose origin had remained a mystery. Now, scientists have turned up a fascinating explanation for this "bladed terrain": the structures are made almost entirely of methane ice, and likely formed as a specific kind of erosion wore away their surfaces.
Published Mercury's poles may be icier than scientists thought


A new study identifies three large surface ice deposits near Mercury's north pole, and suggests there could be many additional small-scale deposits that would dramatically increase the planet's surface ice inventory.
Published Pluto features given first official names


The Working Group for Planetary System Nomenclature of the International Astronomical Union has officially approved the naming of 14 features on the surface of Pluto. These are the first geological features on the planet to be named following the close flyby by the New Horizons spacecraft in July 2015.
Published Equatorial jet in Venusian atmosphere


Observations by Japan's Venus climate orbiter Akatsuki have revealed an equatorial jet in the lower to middle cloud layer of the planet's atmosphere, a finding that could be pivotal to unraveling a phenomenon called superrotation.
Published 'Dragonfly’ dual-quadcopter aims to explore Titan, Saturn’s largest moon


The Dragonfly mission concept would use an instrumented, radioisotope-powered, dual-quadcopter to explore Saturn's largest moon, Titan, one of our solar system’s “ocean worlds.”
Published Brown dwarf weather forecasts improved


Dim objects called brown dwarfs, less massive than the Sun but more massive than Jupiter, have powerful winds and clouds -- specifically, hot patchy clouds made of iron droplets and silicate dust. Scientists recently realized these giant clouds can move and thicken or thin surprisingly rapidly, in less than an Earth day, but did not understand why.
Published Scientists probe Neptune's depths to reveal secrets of icy planets


Scientists have helped solve the mystery of what lies beneath the surface of Neptune -- the most distant planet in our solar system.
Published Successful filming of fastest aurora flickering


Researchers conducted a 3 year continuous high-speed imaging observation at Poker Flat Research Range, Alaska, USA, and identified the physics behind the flickering of aurora. At the same time, they discovered faster flickerings at speeds of 1/60-1/50 and 1/80 of a second.
Published Twilight observations reveal huge storm on Neptune


Striking images of a storm system nearly the size of Earth have astronomers doing a double-take after pinpointing its location near Neptune's equator, a region where no bright cloud has been seen before. The discovery was made at dawn on June 26 as researchers were testing the Keck telescope to see whether it could make useful observations during twilight, a time most astronomers consider unusable because it's not dark enough.
Published Venus's turbulent atmosphere


Astronomers shed light on the so far unexplored nightside circulation at the upper cloud level of Venus. Researchers have discovered unexpected patterns of slow motion and abundant stationary waves in Venus's nighttime sky.
Published Chasing the Total Solar Eclipse from NASA's WB-57F jets


A team of scientists will take to the skies during the Aug. 21 eclipse, using two of NASA's WB-57 jet planes to chase the shadow of the moon for unparalleled observations of the sun and Mercury.
Published Planet Nine hypothesis supported by new evidence


Last year, the existence of an unknown planet in our Solar system was announced. However, this hypothesis was subsequently called into question as biases in the observational data were detected. Now astronomers have used a novel technique to analyze the orbits of the so-called extreme trans-Neptunian objects and, once again, they point out that there is something perturbing them: a planet located at a distance between 300 to 400 times the Earth-Sun separation.
Published Shining a light on solar energetic particles and jets


A big step forward has been made in understanding a 30-year-old mystery in the process of formation of solar flares, report scientists.
Published Topsy-turvy motion creates light switch effect at Uranus


Uranus' magnetosphere, the region defined by the planet's magnetic field and the material trapped inside it, gets flipped on and off like a light switch every day as it rotates along with the planet, scientists have discovered. It's 'open' in one orientation, allowing solar wind to flow into the magnetosphere; it later closes, forming a shield against the solar wind and deflecting it away from the planet.
Published The curious case of the warped Kuiper Belt


The plane of the solar system is warped in the belt's outer reaches, signaling the presence of an unknown Mars-to-Earth-mass planetary object far beyond Pluto, according to new research.
Published New branch in family tree of exoplanets discovered



Researchers have classified exoplanets in much the same way that biologists identify new animal species.
Published MAVEN's top 10 discoveries at Mars


Since its launch in November 2013 and its orbit insertion in September 2014, MAVEN has been exploring the upper atmosphere of Mars. MAVEN is bringing insight to how the sun stripped Mars of most of its atmosphere, turning a planet once possibly habitable to microbial life into a barren desert world.
Published Frost on moon's surface: New evidence


Scientists using data from NASA's Lunar Reconnaissance Orbiter have identified bright areas in craters near the moon's south pole that are cold enough to have frost present on the surface.
Published Neptune: Neutralizer-free plasma propulsion



Plasma propulsion concepts are gridded-ion thrusters that accelerate and emit more positively charged particles than negatively charged ones. To enable the spacecraft to remain charge-neutral, a 'neutralizer' injects electrons to exactly balance the positive ion charge in the exhaust beam, but this neutralizer requires additional power from the spacecraft. Researchers are investigating how the radio-frequency self-bias effect can be used to remove the neutralizer altogether.
Published How radioactive decay could support extraterrestrial life


In the icy bodies around our solar system, radiation emitted from rocky cores could break up water molecules and support hydrogen-eating microbes. To address this cosmic possibility, a team modeled a natural water-cracking process called radiolysis. They then applied the model to several worlds with known or suspected interior oceans, including Saturn's moon Enceladus, Jupiter's moon Europa, Pluto and its moon Charon, as well as the dwarf planet Ceres.