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    VIRGOCosmos In Brief - Aktualní novinky vesmírného výzkumu v kostce




    For every complex question, there's a simple answer that's completely wrong.
    rozbalit záhlaví
    VIRGO
    VIRGO --- ---
    VIRGO:
    Skutečně úžasná ukázka, jak můžou peníze multimiriardáře pomoct astronomii,
    a ta zas pomůže jemu. To je fakt jak z nějakýho snu. Jurij Milner je třída.

    VLT Imager and Spectrometer for mid-Infrared
    https://www.youtube.com/watch?v=WIfu6ZPEfXs
    VIRGO
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    Dalekohled VLT bude pátrat po planetách v systému Alfa Centauri | ESO Česko
    http://www.eso.org/public/czechrepublic/news/eso1702/?lang
    ESO a Breakthrough Initiatives podepsali dohodu o spolupráci

    ESO podepsala dohodu se zástupci společnosti Breakthrough Initiatives týkající se úprav přístrojového vybavení dalekohledu ESO/VLT pro pátrání po planetách
    v blízkém hvězdném systému Alfa Centauri. Tyto planety by se v budoucnu mohly eventuálně stát cílem výzkumu prostřednictvím miniaturních kosmických sond
    navržených v rámci projektu Starshot (Breakthrough Starshot initiative).

    VIRGO
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    Asymmetric structure in the supermassive black hole at the galaxy's center
    http://phys.org/news/2017-01-asymmetric-supermassive-black-hole-galaxy.html

    The supermassive black hole candidate at the center of our Galaxy (associated with the radio source Sgr A*) is a prime candidate for studying
    the physical phenomena associated with accretion on to a supermassive black hole. Sgr A* is thought to accrete at an extremely low rate;
    analogous situations in X-ray binary stars suggest that a jet may be present, making it challenging to formulate a fully self-consistent model
    that simultaneously explains its spectrum, its variability, its size and its shape. Because Sgr A* is by far the closest supermassive black hole,
    its expected angular size (the shadow cast from its event horizon) is the largest of any known black hole candidate, making it a prime target for
    studies using very long baseline interferometry at mm wavelengths, which are capable of reaching spatial resolutions comparable to the expected
    shadow size.

    VIRGO
    VIRGO --- ---
    Study crashes main Moon-formation theory
    http://phys.org/news/2017-01-main-moon-formation-theory.html

    Such a bombardment birth would explain a major inconsistency in the prevailing hypothesis that the Moon splintered off in a single, giant impact
    between Earth and a Mars-sized celestial body. In such a scenario, scientists expect that about a fifth of the Moon's material would have come from
    Earth and the rest from the impacting body. Yet, the makeup of the Earth and the Moon are near identical—an improbability that has long perplexed
    backers of the single-impact hypothesis."The multiple impact scenario is a more 'natural' way of explaining the formation of the Moon," said Raluca
    Rufu of the Weizmann Institute of Science in Rehovot, who co-authored the new study published in the journal Nature Geoscience.

    VIRGO
    VIRGO --- ---
    Outflowing Gas in Ultraluminous Galaxiessu201701 | www.cfa.harvard.edu/
    https://www.cfa.harvard.edu/news/su201701

    Galaxies evolve over billions of years in part through the activity of star formation and their supermassive nuclear black holes,
    and also by mergers with other galaxies. Some features of galaxies, in particular the strong correlations found between the mass
    of the central black hole and properties like galaxy velocity structure or luminosity, imply a fundamental connection between
    the growth of the nuclear black hole and the assembly of stars on a global scale. Feedback of some kind is therefore expected to
    explain these tight correlations, and astronomers have been working to identify and study it. One prominent suggestion for feedback
    is the presence of warm outflowing gas, powered by new stars but which would deplete the galaxy of the raw material needed for
    making new stars, and/or for enhancing the black hole mass.

    VIRGO
    VIRGO --- ---
    https://www.nasa.gov/image-feature/jpl/pia20515/mimas-mountain

    Shadows cast across Mimas' defining feature, Herschel Crater, provide an indication of the size of the crater's towering walls and central peak.
    Named after the icy moon's discoverer, astronomer William Herschel, the crater stretches 139 kilometers wide - almost one-third of the diameter
    of Mimas (396 kilometers) itself. Large impact craters often have peaks in their center. Herschel's peak stands nearly as tall as Mount Everest
    on Earth.

    This view looks toward the anti-Saturn hemisphere of Mimas. North on Mimas is up and rotated 21 degrees to the left. The image was taken with
    the Cassini spacecraft narrow-angle camera on Oct. 22, 2016 using a combination of spectral filters which preferentially admits wavelengths of
    ultraviolet light centered at 338 nanometers. The view was acquired at a distance of approximately 185 000 kilometers from Mimas and at a Sun-
    Mimas-spacecraft, or phase, angle of 20 degrees. Image scale is 1 kilometer per pixel.

    VIRGO
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    Krásný koberec. MAHLI, Sol 1570, 4. leden 2017

    VIRGO
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    VIRGO
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    A montage of Hand-Lens images of Curiosity's weather 'Booms' located on the mast. These are part of the Rover Environmental Monitoring
    Station (REMS) and are being checked out as part of an investigation to a malfunction of one of the wind speed indicators.

    VIRGO
    VIRGO --- ---
    A new CERN experiment targets even higher energies (eventually) | Science | The Guardian
    https://www.theguardian.com/.../jan/08/a-new-cern-experiment-targets-even-higher-energies-eventually

    The AWAKE experiment at CERN made a breakthrough at the end of last year. A long-term technology-development project, its aim is
    to drag electrons through a plasma, behind a beam of protons, and provide a route to higher energies than the Large Hadron Collider

    HOWKING
    HOWKING --- ---
    V jeho případě si říkám, ještě že jsou ty technologie. Nejen že by jinak takový mozek byl uzavřený před světem a znalostmi, ale hlavně by byl svět odříznut od takového mozku!
    VIRGO
    VIRGO --- ---
    VIRGO: Tak zítra nic... Přesunuto na 14. ledna.
    SpaceX Falcon 9 RTF postponed to Jan. 14 - SpaceFlight Insider
    http://www.spaceflightinsider.com/...ploration-technologies/spacex-falcon-9-rtf-postponed-to-jan-14/
    VIRGO
    VIRGO --- ---
    HOWKING: tak pardon, už dnes. :)
    Backreaction: Stephen Hawking turns 75. Congratulations! Here’s what to celebrate.
    http://backreaction.blogspot.cz/2017/01/stephen-hawking-turns-75.html
    Sabine Hossenfelder

    VIRGO
    VIRGO --- ---
    Start Rolling Your Blunts: Spherical Planetarium Videos Are Here | Motherboard
    http://motherboard.vice.com/read/spherical-planetarium-videos

    The Aquarius simulation
    https://www.youtube.com/watch?v=6NIr2zYtHRQ
    VIRGO
    VIRGO --- ---
    Bright stars (including Orion) form a huge ring in the sky. It's a real structure, origin unknown.
    A cluster of thoughts: Why is there a giant ring of young stars surrounding us?
    http://aclusterofthoughts.blogspot.cz/2015/08/why-is-there-giant-ring-of-young-stars.html

    VIRGO
    VIRGO --- ---
    V pondělí před půl osmou večer: SpaxeX znovu a lépe!
    SpaceX set to launch again Monday
    http://phys.org/news/2017-01-spacex-monday.html
    VIRGO
    VIRGO --- ---
    Siegel jak jinak než prudce stylově... :))

    HOWKING
    HOWKING --- ---
    VIRGO: Na to že už měl být 40 let mrtvý podle prognóz :-)
    VIRGO
    VIRGO --- ---
    Scientists close in on the true mass of the Milky Way by calculating what they know, what they partially know and what is still uncertain | McMaster Daily News
    http://dailynews.mcmaster.ca/...what-they-know-what-they-partially-know-and-what-is-still-uncertain/

    It’s a problem of galactic complexity, but researchers are getting closer to accurately measuring the mass of the Milky Way Galaxy.

    In the latest of a series of papers that could have broader implications for the field of astronomy, McMaster astrophysicist Gwendolyn Eadie,
    working with her PhD supervisor William Harris and with a Queen’s University statistician, Aaron Springford, has refined Eadie and Harris’s
    own method for measuring the mass of the galaxy that is home to our solar system.

    The short answer, using the refined method, is between 4.0 X 10^11 and 5.8 X 10^11 solar masses. In simpler terms, that’s about the mass of our Sun,
    multiplied by 400 to 580 billion. The Sun, for the record, has a mass of two nonillion (that’s 2 followed by 30 zeroes) kilograms, or 330 000 times
    the mass of Earth. This Galactic mass estimate includes matter out to 125 kiloparsecs from the center of the Galaxy (125 kiloparsecs is almost
    4 X 10^18 kilometers). When the mass estimate is extended out to 300kpc, the mass is approximately 9 X 10^11 solar masses.

    Measuring the mass of our home galaxy, or any galaxy, is particularly difficult. A galaxy includes not just stars, planets, moons, gases, dust and
    other objects and material, but also a big helping of dark matter, a mysterious and invisible form of matter that is not yet fully understood and
    has not been directly detected in the lab. Astronomers and cosmologists, however, can infer the presence of dark matter through its gravitational
    influence on visible objects.
    VIRGO
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    Velký předěl po letech vývoje a výroby: NASA poprvé oficiální cestou oslovila vědce, aby začali podávat návrhy pro první pozorování JWST od dubna 2019.
    VIRGO
    VIRGO --- ---
    News | Black Holes Hide in Our Cosmic Backyard
    http://www.jpl.nasa.gov/news/news.php?release=2017-005

    Monster black holes sometimes lurk behind gas and dust, hiding from the gaze of most telescopes. But they give themselves away when material
    they feed on emits high-energy X-rays that NASA's NuSTAR (Nuclear Spectroscopic Telescope Array) mission can detect. That's how NuSTAR recently
    identified two gas-enshrouded supermassive black holes, located at the centers of nearby galaxies.

    "These black holes are relatively close to the Milky Way, but they have remained hidden from us until now," said Ady Annuar, a graduate student
    at Durham University in the United Kingdom, who presented the results at the American Astronomical Society meeting in Grapevine, Texas. "They're
    like monsters hiding under your bed."

    Both of these black holes are the central engines of what astronomers call "active galactic nuclei," a class of extremely bright objects that
    includes quasars and blazars. Depending on how these galactic nuclei are oriented and what sort of material surrounds them, they appear very
    different when examined with telescopes.

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