This artist’s impression shows a two-star system where micronovae may occur. The blue disc swirling around the bright white dwarf in the centre of the image is made up of material, mostly hydrogen, stolen from its companion star. Towards the centre of the disc, the white dwarf uses its strong magnetic fields to funnel the hydrogen towards its poles. As the material falls on the hot surface of the star, it triggers a micronova explosion, contained by the magnetic fields at one of the white dwarf’s poles.
A team of astronomers, with the help of the European Southern Observatory’s Very Large Telescope (ESO’s VLT), have observed a new type of stellar explosion — a micronova. These outbursts happen on the surface of certain stars, and can each burn through around 3...
Potential dunes on Jupiter’s moon Io. An analysis indicates that the dark material (lower left) is recently emplaced lava flows, while the repeated, line-like features dominating the image are potential dunes. The bright, white areas may be newly emplaced grains as the lava flows vaporize adjacent frost. Credit: NASA/JPL-Caltech/Rutgers
New way dunes can form on varied celestial surfaces. Scientists have long wondered how Jupiter’s innermost moon, Io, has meandering ridges as grand as any that can be seen in movies like “Dune.” Now, a Rutgers research study has provided a new explanation of how dunes can form even on a surface as icy and roiling as Io’s.
The study, published in the journal Nature Communications, is based on a study of the physical processes controlling grain motion ...
This artist’s conception shows how double ridges on the surface of Jupiter’s moon Europa may form over shallow, refreezing water pockets within the ice shell. This mechanism is based on the study of an analogous double ridge feature found on Earth’s Greenland Ice Sheet. (Image credit: Justice Blaine Wainwright)
Ice-penetrating radar data from Greenland suggests that shallow water pockets may be common within Europa’s ice shell, increasing the potential habitability of the Jovian moon’s ice shell.
Europa is a prime candidate for life in our solar system, and its deep saltwater ocean has captivated scientists for decades. But it’s enclosed by an icy shell that could be miles to tens of miles thick, making sampling it a daunting prospect...
Colliding spherical pressure waves from a phase transition at around 10 picoseconds after the Big Bang would generate gravitational waves observable by LISA. (Image: David Weir)
The early universe may chirp about unknown physics. A University of Helsinki research team has demonstrated how an early universe phase transition will lead to gravitational wave signals potentially visible in the upcoming satellite missions. The research results were recently published in the journal Physical Review Letters.
Phase transitions, such as the boiling of water or the melting of a metal, are commonplace but fascinating phenomena that spur surprises decades after decades...
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