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    VIRGOCosmos In Brief - Aktualní novinky vesmírného výzkumu v kostce
    VIRGO
    VIRGO --- ---
    Swift Mission Catches a Comet Slowdown
    https://www.youtube.com/watch?v=oe-d9RxLLaM


    NASA's Newly Renamed Swift Mission Spies a Comet Slowdown
    https://www.nasa.gov/feature/goddard/2018/nasas-newly-renamed-swift-mission-spies-a-comet-slowdown

    Observations by NASA's Swift spacecraft, now renamed the Neil Gehrels Swift Observatory after the mission’s late principal investigator, have
    captured an unprecedented change in the rotation of a comet. Images taken in May 2017 reveal that comet 41P/Tuttle-Giacobini-Kresák — 41P for short
    — was spinning three times slower than it was in March, when it was observed by the Discovery Channel Telescope at Lowell Observatory in Arizona.

    VIRGO
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    http://greenbankobservatory.org/hydrogen-clouds-from-galaxy-center/

    A team of astronomers has discovered what appears to be a grand exodus of more than 100 hydrogen clouds streaming away from the center of the Milky Way
    and heading into intergalactic space. This observation, made with the National Science Foundation’s Green Bank Telescope (GBT), may give astronomers
    a clearer picture of the so-called Fermi Bubbles, giant balloons of superheated gas billowing out above and below the disk of our galaxy.
    VIRGO
    VIRGO --- ---
    2x C/2016 R2 Panstarrs. Nádhera!



    Taken by michael jäger on January 10, 2018 @ Hochbärneck Austria



    Taken by Gerald Rhemann on January 9, 2018 @ Farm Tivoli, Namibia SW-Africa
    VIRGO
    VIRGO --- ---
    https://www.forbes.com/...atter-physics-could-solve-the-expanding-universe-controversy/#23685d407a8c

    There's an enormous controversy in astrophysics today over how quickly the Universe is expanding. One camp of scientists, the same camp that won
    the Nobel Prize for discovering dark energy, measured the expansion rate to be 73 km/s/Mpc, with an uncertainty of only 2.4%. But a second method,
    based on the leftover relics from the Big Bang, reveals an answer that's incompatibly lower at 67 km/s/Mpc, with an uncertainty of only 1%. It's
    possible that one of the teams has an unidentified error that's causing this discrepancy, but independent checks have failed to show any cracks in
    either analysis. Instead, new physics might be the culprit. If so, we just might have our first real clue to how dark matter might be detected.

    Animation of cosmic distance ladder
    https://www.youtube.com/watch?v=sQbtjUgIVhg
    VIRGO
    VIRGO --- ---
    A Quick Look at the Galactic Center
    https://www.youtube.com/watch?v=uiidT4DH1Es
    VIRGO
    VIRGO --- ---
    Dark Energy Survey publicly releases first three years of data | News
    http://news.fnal.gov/2018/01/dark-energy-survey-publicly-releases-first-three-years-of-data/

    At a special session held during the American Astronomical Society meeting in Washington, D.C., scientists on the Dark Energy Survey (DES)
    announced today the public release of their first three years of data. This first major release of data from the Survey includes information
    on about 400 million astronomical objects, including distant galaxies billions of light-years away as well as stars in our own galaxy.

    VIRGO
    VIRGO --- ---
    Ingredients for Life Revealed in Meteorites That Fell to Earth
    http://newscenter.lbl.gov/2018/01/10/organic-meteorites/

    Study, based in part at Berkeley Lab, also suggests dwarf planet in asteroid belt may be a source of rich organic matter

    VIRGO
    VIRGO --- ---
    Building a mirror for any giant telescope is no simple feat. But the recent castings of the 15-metric ton, off-axis mirrors
    for the Giant Magellan Telescope forced engineers to push the design & manufacturing process beyond all previous limits.

    Casting a $20 Million Mirror for the World’s Largest Telescope
    https://www.youtube.com/watch?v=M2f4zepwcy8
    VIRGO
    VIRGO --- ---
    The long and short of it: Iron-rich stars host shorter-period planets | SDSS | Press Releases
    http://www.sdss.org/press-releases/long-short-iron/

    Astronomers with the Sloan Digital Sky Survey (SDSS) have learned that the chemical composition of a star
    can exert unexpected influence on its planetary system — a discovery made possible by an ongoing SDSS survey
    of stars seen by NASA’s Kepler spacecraft, and one that promises to expand our understanding of how extrasolar
    planets form and evolve.

    VIRGO
    VIRGO --- ---
    https://www.nasa.gov/.../new-sofia-observations-help-unravel-mysteries-of-the-birth-of-colossal-suns

    Astronomers are observing star-forming regions in our galaxy with NASA’s flying telescope, the Stratospheric Observatory for Infrared Astronomy, SOFIA, to
    understand the processes and environments required to create the largest known stars, which tip the scales at ten times the mass of our own Sun or more.

    The research team, led by James M. De Buizer, SOFIA senior scientist and Jonathan Tan at Chalmers University of Technology, Gothenburg, Sweden and the University
    of Virginia, has published observations of eight extremely massive and young stars located within our Milky Way Galaxy. SOFIA’s powerful camera, the Faint Object
    infraRed Camera for the SOFIA Telescope, known as FORCAST, allowed the team to probe warm, dusty regions that are heated by light from luminous, massive stars that
    are still forming. SOFIA’s airborne location, flying above more than 99 percent of Earth’s infrared-blocking water vapor coupled with its powerful instruments, make
    it the only observatory that can study the stars at the wavelengths, sensitivity, and resolution necessary to see inside the dense dust clouds from which these
    stars are born.

    VIRGO
    VIRGO --- ---
    Winds of change: Supermassive black holes can overpower even the smallest galaxies | SDSS | Press Releases
    http://www.sdss.org/press-releases/winds-of-change/

    Today, astronomers from the Sloan Digital Sky Survey report a surprising new answer to that important question:
    feedback from supermassive black holes blocks star formation, even in some of the smallest galaxies.

    The results, being presented at the American Astronomical Society (AAS) meeting in National Harbor, Maryland on
    Thursday and soon to be published in the Monthly Notices of the Royal Astronomical Society, represent a major
    step forward in our understanding of how dwarf galaxies — some of the smallest in our Universe — are prevented
    from forming stars.

    VIRGO
    VIRGO --- ---
    Meteorites reveal story of Martian climate | Lawrence Livermore National Laboratory
    https://www.llnl.gov/news/meteorites-reveal-story-martian-climate

    Liquid water is not stable on Mars’ surface because the planet’s atmosphere is too thin and temperatures are too cold. However,
    at one time Mars hosted a warm and wet surface environment that may have been conducive to life. A significant unanswered question
    in planetary science is when Mars underwent this dramatic change in climate conditions.

    New research by Lawrence Livermore National Laboratory (LLNL) cosmochemist Bill Cassata shows that, by looking at trapped gasses
    in ancient Martian meteorites, the timing and effectiveness of atmospheric escape processes that have shaped Mars’ climate can be
    pinned down. The research appears in Earth and Planetary Science Letters.

    Cassata analyzed the Martian atmospheric gas xenon (Xe, in two ancient Martian meteorites, ALH 84001 and NWA 7034. The data indicate
    that early in Martian history there was a sufficient concentration of atmospheric hydrogen to mass fractionated Xe (selectively removed
    light isotopes) through a process known as hydrodynamic escape. However, the measurements suggest this process culminated within a few
    hundred million years of planetary formation (more than 4 billion years ago), and little change to the atmospheric Xe isotopic
    composition has occurred since this time.
    VIRGO
    VIRGO --- ---
    Aerospace engineers developing drone for NASA concept mission to Titan | Penn State University
    http://news.psu.edu/...1/09/research/aerospace-engineers-developing-drone-nasa-concept-mission-titan

    Researchers from the Penn State Department of Aerospace Engineering are part of a team led by the Johns Hopkins Applied Physics Laboratory
    (APL) whose proposal for a revolutionary rotorcraft to investigate Saturn’s largest moon, Titan, has been selected by NASA as one of two
    finalists for the agency’s next New Frontiers mission.

    Dragonfly, a drone-like multi-rotor lander, would take advantage of Titan’s dense atmosphere (four times denser than Earth’s atmosphere)
    and low gravity (one-seventh of Earth's) to fly between widely-spaced landing sites on Titan’s surface. At each landing site, Dragonfly
    would employ a suite of science instruments to investigate Titan’s organic chemistry and habitability; monitor atmospheric and surface
    conditions; image landforms to investigate geological processes; and perform seismic studies.

    VIRGO
    VIRGO --- ---
    https://www.nasa.gov/image-feature/new-day

    "A view of the sunrise from the ISS is a perfect start to a new day," so said @Anton_Astrey, otherwise known as cosmonaut
    Anton Shkaplerov, who is currently stationed aboard the International Space Station, orbiting 250 miles above the Earth.

    VIRGO
    VIRGO --- ---
    Sun like it hot | Horizon: the EU Research & Innovation magazine | European Commission
    https://horizon-magazine.eu/article/sun-it-hot_en.html

    Few would be surprised to learn that the sun is very, very hot. At its surface, the temperature is several thousand degrees Celsius.

    But you might think that, like a fire, the temperature drops as you move away from the surface. In fact, way out in the sun’s corona
    (the outermost part of its atmosphere) the temperature rises swiftly – to several million degrees.

    The reason is a mystery, but now some scientists believe they’re on the verge of finding out.

    VIRGO
    VIRGO --- ---
    How massive is Supermassive? Astronomers measure more black holes, farther away | SDSS | Press Releases
    http://www.sdss.org/press-releases/how-massive/

    Today, astronomers from the Sloan Digital Sky Survey (SDSS) announced new measurements
    of the masses of a large sample of supermassive black holes far beyond the local Universe.

    The results, being presented at the American Astronomical Society (AAS) meeting in National Harbor,
    Maryland and published in the Astrophysical Journal, represent a major step forward in our ability
    to measure supermassive black hole masses in large numbers of distant quasars and galaxies.

    VIRGO
    VIRGO --- ---
    VIRGO: Heino Falcke:
    It could well take a few more years to get a really „nice“ image of a black hoke. In any case it will be
    exciting to finally touch first real imaging EHT data next year - irrespective of how good or bad it may be.
    VIRGO
    VIRGO --- ---
    Most images of black holes are illustrations. Here’s what our telescopes actually capture. - Vox
    https://www.vox.com/science-and-health/2018/1/8/16822272/black-hole-looks-like-what/

    Most images of black holes are illustrations. This soon may change. An audacious global project called
    the Event Horizon Telescope is currently working to piece together an image of a black hole for the first time.

    VIRGO
    VIRGO --- ---
    Hurá!!

    První segmenty primárního zrcadla dalekohledu ELT úspěšně odlity | ESO Česko
    http://www.eso.org/public/czechrepublic/news/eso1801/?lang

    Německá firma SCHOTT ve své továrně ve městě Mainz úspěšně odlila prvních šest segmentů primárního zrcadla pro dalekohled ELT. Hlavní zrcadlo dalekohledu ELT bude
    mít průměr 39 m a bude ho tvořit celkem 798 šestiúhelníkových segmentů. Po dokončení v roce 2024 by se dalekohled ELT měl stát největším optickým teleskopem na světě.

    Primární zrcadlo připravovaného dalekohledu ELT (Extremely Large Telescope) bude s průměrem 39 m zdaleka největším, jaké bylo kdy osazeno v jakémkoliv dalekohledu
    pro viditelnou nebo infračervenou oblast. Takto velké zrcadlo je však příliš velké na to, aby bylo možné ho vyrobit z jednoho kusu skla. Proto bude sestaveno ze 798
    šestiúhelníkových segmentů o průměru 1,4 m a tloušťce 5 cm. Jednotlivé díly budou uloženy tak, aby mohly pracovat společně jako jedna optická plocha, která posbírá
    dvacetmilionkrát více světla než lidské oko.

    ESOcast Light 145: First ELT Main Mirror Segments Successfully Cast
    https://www.youtube.com/watch?v=85Qcbn8nlaM
    VIRGO
    VIRGO --- ---
    First PEPSI data release — English
    http://www.aip.de/en/news/science/first-pepsi-data-release

    The Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) at the Large Binocular Telescope (LBT) in Arizona
    released its first batch of high-spectral resolution data to the scientific community. In a series of three papers in
    the European journal Astronomy & Astrophysics, the PEPSI team presents a new spectral atlas of the Sun, a total of 48
    atlases of bright benchmark stars, and a detailed analysis of the chemical abundances of the 10-billion year old planet-
    system host Kepler-444.

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