Turbulence in Planetary Cores

Authors: George Rajna

Veritable shields against high-energy particles, planets' magnetic fields are produced by iron moving in their liquid core. Yet the dominant model for explaining this system does not fit the smallest celestial bodies. [28] Thanks to an innovative ring laser design, geophysicists at LMU can now measure and monitor Earth's rotation with unprecedented accuracy. [27] Spiral galaxies are found to be strongly rotating, with an angular momentum higher by a factor of about five than ellipticals. [26] Throughout the universe, supersonic shock waves propel cosmic rays and supernova particles to velocities near the speed of light. [25] A team of astronomers from the Inter University Centre for Astronomy & Astrophysics (IUCAA), and Indian Institute of Science Education and Research (IISER), both in Pune, India, and members of two other Indian universities, have identified a previously unknown, extremely large supercluster of galaxies located in the direction of constellation Pisces. [24] Enigmatic 'dark energy', thought to make up 68% of the universe, may not exist at all, according to a Hungarian-American team. [23] Astronomers in the US are setting up an experiment which, if it fails – as others have – could mark the end of a 30-year-old theory. [22] Russian scientists have discovered that the proportion of unstable particles in the composition of dark matter in the days immediately following the Big Bang was no more than 2 percent to 5 percent. Their study has been published in Physical Review D. [21] Researchers from the University of Amsterdam's (UvA) GRAPPA Center of Excellence have just published the most precise analysis of the fluctuations in the gamma-ray background to date. [20] The Dark Energy Spectroscopic Instrument, called DESI, has an ambitious goal: to scan more than 35 million galaxies in the night sky to track the expansion of our universe and the growth of its large-scale structure over the last 10 billion years. [19] If the axion exist and it is the main component of Dark Matter, the very relic axions that would be bombarding us continuously could be detected using microwave resonant (to the axion mass) cavities, immersed in powerful magnetic fields. [18]

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[v1] 2017-07-24 08:40:49

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