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    VIRGOCosmos In Brief - Aktualní novinky vesmírného výzkumu v kostce
    VIRGO
    VIRGO --- ---
    A Massive Galaxy Long Ago and Far Awaysu201705 | www.cfa.harvard.edu/
    https://www.cfa.harvard.edu/news/su201705

    CfA astronomers Charlie Conroy and Jieun Choi and eight colleagues used the spectrometer on the Keck telescope
    (along with some secondary datasets) to obtain very sensitive magnesium measurements in one of the most massive
    and luminous elliptical galaxies known. The galaxy, seen at an epoch only three billion years after the big bang,
    has a stellar mass of about three hundred billion solar-masses (the Milky Way’s stellar mass is about ten times
    less) but is currently making stars at a rate only about half that of the Milky Way. However, it's magnesium-to-
    iron ratio indicates that earlier in its life it was making stars at a phenomenally high rate, perhaps as many
    as several thousand solar-masses each year, making it one of the most vigorous examples of star-formation known.

    VIRGO
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    Researchers discover a black hole feeding frenzy that breaks records
    https://phys.org/news/2017-02-black-hole-frenzy.html

    A giant black hole ripped apart a nearby star and then continued to feed off its remains for close to a decade, according to research
    led by the University of New Hampshire. This black hole meal is more than 10 times longer than any other previous episode of a star's death.

    "We have witnessed a star's spectacular and prolonged demise," said Dacheng Lin, a research scientist at UNH's Space Science Center and
    the study's lead author. "Dozens of these so-called tidal disruption events have been detected since the 1990s, but none that remained bright
    for nearly as long as this one."

    VIRGO
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    +1
    Když hvězdy vybuchují | ESO Česko
    http://www.eso.org/public/czechrepublic/images/potw1706a/

    Ve vzdálenosti větší než 75 milionů světelných let v souhvězdí Panny (Virgo) leží NGC 4981 - spirální galaxie s poněkud explozivní minulostí.

    NGC 4981 byla objevena sedmnáctého dubna 1784 Williamem Herschelem a později zdokumentována v katalogu NGC (New General Catalogue) Johna Dreyera.
    O více než století, dvacátého třetího dubna 1968, se galaxie znovu dostala do zpráv, když v ní vybuchla supernova typu Ia (hvězdná exploze v
    dvojhvězdném systému) jménem SN 1968l. O několik desetiletí později kolaps jádra masivní hvězdy vedl k supernově SN 2007c.

    Krásný záběr NGC 4981 - bez žádného výbuchu supernovy; jasná hvězda na obrázka je hvězda v popředí - byl pořízen přístrojem FORS (FOcal Reducer
    and low dispersion Spectrograph), který pracuje ve viditelné a blízké ultrafialové oblasti na dalekohledu ESO VLT (Very Large Telescope). FORS
    je mezi přístroji ESO švýcarským armádním nožem - dokáže studovat mnoho různých astronomických objektů různými způsoby a je zodpovědný za mnoho
    ikonických fotografií pořízených pomocí VLT (viz např. eso9948f a eso0202a).

    VIRGO
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    +2
    Wonderful sand dunes captured by Left & Right Navcam on Sol 1601 (Feb 6).
    Nice birthday present to Curio´s 1600-th Sol!

    VIRGO
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    1 odpověď
    Bright green fireball illuminates the sky over Illinois, US
    https://watchers.news/2017/02/06/fireball-illinois-wisconsin-february-6-2017/

    A bright green fireball illuminated the sky over Illinois and Wisconsin at 07:25 UTC (01:25 CST) on February 6, 2017. It was captured by numerous cameras.

    The American Meteor Society received over 170 eyewitness reports by 09:40 UTC and they are still coming in. Some of them said sound and fragmentation was
    associated with the event. The green fireball was seen primarily from Illinois and Wisconsin but witnesses from Michigan, Indiana, Ohio, Iowa, New York,
    Kentucky, Minnesota and Ontario also reported the event.

    Midwest Meteor Police Dash Cam
    https://www.youtube.com/watch?v=cF0POBcZQRk
    VIRGO
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    http://www.imo.net/doomsday-asteroid-is-not-to-come-in-february-2017/

    The news is slowly widespreading over the Internet… According to the DailyMail online, a “self-proclaimed astronomer”,
    Dr Dyomin Damir Zakharovich, predicts that an asteroid will crash on the Earth on February 16th, 2017, creating a mega-tsunami…

    The asteroid is known: 2016 WF9, an Apollo-type asteroid, was discovered by NEOWISE (Near Earth Object Wide field Infrared Survey Explorer) on November
    27th, 2016, and its size is currently estimated to be around 400 m diameter. It will cross the ecliptic plane in mid-February, but according to modelizations,
    based on 61 past observations of the small body, it will be 53 millions of kilometers from our planet on February 16th… and will actually at its closest point to
    the Earth 9 days later, on February 25th, but always at a respectful distance of more than 51 millions of kilometers. So be sure everybody will be safe on
    February 16th! Or at least, if anything happens, it won’t have anything to do with asteroids! Or at least, not this one!

    VIRGO
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    +2
    Ireson Hill Navcam on Sol 1598 by Seán Doran.

    VIRGO
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    Weird Warm Spot on Exoplanet (Narrated)
    https://www.youtube.com/watch?v=mK8lOi3lQhg
    VIRGO
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    Conditions right for stars, planets near Milky Way’s supermassive black hole | Science News
    https://www.sciencenews.org/...onditions-right-stars-planets-near-milky-ways-supermassive-black-hole
    Blobs of gas near galaxy’s center appear ripe for nurturing new stellar systems

    Blobs of gas near the Milky Way’s center may be just the right mass to harbor young stars and possibly planets, too.
    Any such budding stellar systems would face an uphill battle, developing only about two light-years from the galaxy’s
    central supermassive black hole with its intense gravity and ultraviolet radiation. But it’s not impossible for
    the small stars to survive in the hostile place, a new study suggests.

    VIRGO
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    +3
    Excellent view of four operational antennas (L2R) - the 70 metre dish DSS 43 and the 34 metre dishes DSS 36, DSS 35 & DSS 34. Photo: G.Boyd.

    XCHAOS
    XCHAOS --- ---
    tenhle XKCD:
    1791: Telescopes: Refractor vs Reflector - explain xkcd
    https://explainxkcd.com/1791/
    mi přivedl k rychlé rekapitulaci tématu (znám argumentaci již od dětství) a současně k zajímavému aktuálnímu nápadu: ve volném kosmu by šlo zřejmě sestavit refraktory s rozměry daleko převyšujícími to, co bylo možné v 19.století a navíc to zkombinovat s eliminaci vlivů atmosféry.

    refraktory totiž dosahují většího zvětšení, které by mohlo hrát roli při přímém pozorování exoplanet. hlavní argumenty, proč je nešlo dále zvětšovat - tedy gravitační deformace a celkově omezená mechanická odolnost materiály čočky a hmotnost a rozměry tubusu - přece ve stavu beztíže nehrají žádnou roli (a obří kosmický refraktor by navíc šlo vybavit volně letícím "starshade" stínítkem, stejně jako plánované teleskopy)

    (nechce se mnou někdo rozjet crowdfunding kosmického refraktoru? :-)
    VIRGO
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    Tail of Stray Black Hole hiding in the Milky Way | News | National Astronomical Observatory of Japan NOBEYAMA
    http://www.nro.nao.ac.jp/en/news/2017/0116-yamada-e.html
    By analyzing the gas motion of an extraordinarily fast-moving cosmic cloud in a corner of the Milky Way,
    astronomers found hints of a wandering black hole hidden in the cloud. This result marks the beginning
    of the search for quiet black holes; millions of such objects are expected to be floating in the Milky Way
    although only dozens have been found to date.

    VIRGO
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    Bollocks rychlokurz :D
    Interdimensional UFO Portal Tutorial!
    https://www.youtube.com/watch?v=FOkgpfcnG8o
    VIRGO
    VIRGO --- ---
    Čerstvý SETI pokec: Christopher McKee

    How Stars Form - Christopher McKee (SETI 2017)
    https://www.youtube.com/watch?v=y6Lz0RJhRos
    VIRGO
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    LSST, Keckův koronograf a spousta dalších věcí...
    Weekly Space Hangout - Feb 3, 2017: Dr. Meredith Rawls & the LSST
    https://www.youtube.com/watch?v=FIYCaCOfH8c
    VIRGO
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    VIRGO:
    Petr Horálek — Všechnopárty — iVysílání — Česká televize
    http://www.ceskatelevize.cz/...ni/10090925908-vsechnoparty/217522161600004/obsah/520735-petr-horalek
    VIRGO
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    Why Warp Speed Will Never Happen - NBC News
    http://www.nbcnews.com/mach/features/why-warp-speed-will-never-happen-n716081
    VIRGO
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    https://plus.google.com/u/0/+RhysTaylorRhysy/posts/idjDPr1KJxU

    VIRGO
    VIRGO --- ---
    +1
    Lístky dnešním dnem v předprodeji :)

    Bluedot Festival
    http://www.discoverthebluedot.com/

    Bluedot Festival 2017 line up announced with Orbital, Pixies and alt-J headlining - Manchester Evening News
    http://www.manchestereveningnews.co.uk/...usic-nightlife-news/bluedot-festival-2017-line-up-12542013

    Something unique and out of this world.
    https://www.youtube.com/watch?v=NtP2tBHhHHg
    VIRGO
    VIRGO --- ---
    +2
    » Life Under a Black Sun
    http://sciworthy.com/science-news/life-under-a-black-sun/
    Every living thing on our Earth has to thank the Sun for its ability to survive, as it warms the Earth to liveable temperatures.
    It is hard for us to imagine how a civilization could function without a star shining bright in the sky of its host planet.

    Scientists in the Czech Republic have been researching if a planet could harness enough energy to run a civilization if the planet
    were orbiting a black hole instead of a star. This would work in a fundamentally different way than how our planet and civilization
    work. The sun emits light and UV-radiation, the type of sunshine that causes a sunburn. This light and radiation carry energy that
    gets used by things like plants and solar panels. Black holes don’t produce light1, hence the name black holes, but they have mind-
    boggling amounts of gravity, enough to attract light and radiation.
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