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    VIRGOCosmos In Brief - Aktualní novinky vesmírného výzkumu v kostce
    VIRGO
    VIRGO --- ---
    Kepler & K2 Science Conference IV - Kepler & K2 Science Center
    https://keplerscience.arc.nasa.gov/scicon4/

    VIRGO
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    Space in Videos - 2017 - 01 - ESA Euronews: Hunting Earth-like exoplanets
    http://www.esa.int/spaceinvideos/Videos/2017/01/ESA_Euronews_Hunting_Earth-like_exoplanets

    In this edition of Space, Euronews correspondent Jeremy Wilks reports from the Observatory
    of Geneva - home to experts in exoplanets, the name given to planets outside our solar system.

    So far they have managed to find more than 3500 exoplanets but they believe there could be
    literally billions of them across the Milky Way.
    VIRGO
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    +3
    How Many Planets in the Universe? | Part 1: Our Galaxy
    https://www.youtube.com/watch?v=QQbp91m16Fw


    ---

    The PHL's Habitable Universe web page provides estimates on the number of habitable worlds in the universe. Here we use the latest data and models
    to estimate the number of potentially habitable exoplanets, those Earth-size planets orbiting within the habitable zone of stars, starting from the
    nearby stars, our home galaxy, to the whole observable universe. All estimates show both conservative and optimistic values, which are based on
    corresponding definitions of the habitable zone. So far, only up to 30 potentially habitable exoplanets have been identified, none yet Earth-like.
    This page is only updated as new information is available.

    The Habitable Universe - Planetary Habitability Laboratory @ UPR Arecibo
    http://phl.upr.edu/projects/habuniverse

    ---

    Tales from the Exoplanet Archive: How NASA Keeps Track of Alien Worlds
    http://www.space.com/35470-exoplanet-archive-tracks-alien-worlds.html

    The Milky Way is littered with a vast diversity of planets: giants that blur the line between planet and failed-star brown dwarf; tiny worlds similar in size to Earth's
    moon; planets that take 100,000 years to orbit their suns or whip around in hours; lava worlds; ice worlds; and planets that circle multiple suns or whirling pulsars.

    Scientists find them by watching stars that wobble, change gravity, vary in color or dip slightly in brightness. (This last strategy is employed by the most prolific
    planet hunter of all time, NASA's Kepler space telescope.) And someone needs to keep track of them all. Rachel Akeson, deputy director at the NASA Exoplanet Science
    Institute, leads the space agency's Exoplanet Archive, which is tasked with cataloging the ever-growing
    horde of planets known to exist outside the solar system.

    VIRGO
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    Weekly Space Hangout - Jan 27, 2017: Kimberly Cartier & Exoplanet WASP 103b
    https://www.youtube.com/watch?v=j_3_BJ0uAzc
    VIRGO
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    Asteroid 2017 BH 30 (průměr ~ 7-10 m) proletí v pondělí ráno kolem 04:51 UT asi 40 000 km od Země (0.17 LD)
    Nejbližší průlet kolem Měsíce (~ 280 000 km) v pondělí +/- 09:21 UT



    Objeven dnes díky prohlídce Catalina Sky Survey 29/01/17).
    IAU Minor Planet Center
    http://www.minorplanetcenter.net/db_search/show_object?object_id=2017+BH30

    VIRGO
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    Water Underground | How did our planet get its water?
    http://blogs.egu.eu/network/water-underground/2017/01/26/how-did-our-planet-get-its-water/

    Planet Earth makes its own water from scratch deep in the mantle | New Scientist
    https://www.newscientist.com/...75-planet-earth-makes-its-own-water-from-scratch-deep-in-the-mantle/
    VIRGO
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    Latest SETI Talks - Exocomets: Now you see them, now you don't - Barry Welsh, UC Berkeley
    Exocomets: Now you see them, now you don't - Barry Welsh(SETI Talks 2017)
    https://www.youtube.com/watch?v=FsCRNq0lGts


    Present technology does not enable us to view images of these kilometer-sized infalling bodies, but the evaporation of gaseous products
    liberated from exocomets that occurs close to a star can potentially cause small disruptions in the ambient circumstellar disk plasma.
    For circumstellar disks that are viewed “edge-on” this evaporating material may be directly observed through transient (night-to-night
    and hour-to-hour) gas absorption features seen at rapidly changing velocities. Using high resolution spectrographs mounted to large
    aperture ground-based telescopes, we have discovered 15 young stars that harbor swarms of exocomets. In this lecture we briefly describe
    the physical attributes of comets in our own solar system and the instrumental observing techniques to detect the presence of evaporating
    exocomets present around stars with ages in the 10 – 100 Myr range. We note that this work has particular relevance to the dramatic
    fluctuations in the flux recorded towards “Tabby’s star” by the NASA Kepler Mission, that may be explained through the piling up of
    swarms of exocomets in front of the central star.
    OMNIHASH
    OMNIHASH --- ---
    VIRGO: škoda, že je to superzemě s minimální dobou oběhu a pravděpodobně s vázanou rotací na slunce.
    VIRGO
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    +6
    Tohle světlo a barvy snad uvidíme příští rok na Velké výpravě... :)



    VIRGO
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    +4
    Does anyone know the context of this picture?...



    :)))
    VIRGO
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    https://www.newscientist.com/round-up/ligodetection/

    To celebrate the one-year anniversary of a discovery that changed the face of astronomy,
    on 7 February we feature the exclusive world premiere of a new documentary.

    LIGO Detection trailer
    https://www.youtube.com/watch?v=1xX4x3WyXRo
    VIRGO
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    +2
    VIRGO: A ještě jedno video s komentářem, protože téma si to zaslouží.
    It's Faster! Flickering Quasars Used To Measure Universe Expansion
    https://www.youtube.com/watch?v=ql5I48S29gA
    VIRGO
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    Dark plasma on the Sun
    https://www.youtube.com/watch?v=yfKEIvp0ojg
    VIRGO
    VIRGO --- ---
    1 odpověď
    VIRGO:
    Accelerating Universe
    https://www.youtube.com/watch?v=EJESqY3T9a4
    NEBULA
    NEBULA --- ---
    +1
    VIRGO: to je nádhera! :)
    VIRGO
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    1 odpověď
    VIRGO:
    http://www.forbes.com/...ing-faster-than-expected-but-new-results-raise-more-questions/#7620b8f123b5

    VIRGO
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    ATNF Daily Astronomy Picture
    http://www.atnf.csiro.au/ATNF-DailyImage/archive/2017/24-Jan-2017.html
    Resolved magnetic structures in the disk-halo interface of NGC 628
    by George Heald (CASS)

    Spiral galaxies host large-scale magnetic fields that evolve over millions of years via turbulence in the Interstellar Medium and the rotation of the galaxy itself.
    These galactic-sized magnetic fields contain an ordered component, primarily located in the regions between the spiral arms, where randomness imposed by the star
    formation process is low. Such ordered magnetic fields and their directionality can be efficiently observed with cm-wavelength radio synchrotron radiation, and its
    degree of linear polarisation. The above picture shows an optical image of the face-on spiral galaxy NGC628 as observed with the Calar Alto 1.23-m telescope in Spain,
    superimposed with flow lines showing the direction of the ordered large-scale magnetic field as observed with the Jansky Very Large Array (JVLA) at radio frequencies
    between 2-4 GHz. The image is presented as part of new work by a team including George Heald (CASS) that was recently accepted for publication. The research also
    found evidence for two drivers of magnetic turbulence in the disk-halo region of NGC 628, namely, Parker instabilities and superbubbles.

    VIRGO
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    Clingy Alien Planets May Fling Their Moons Out of Orbit
    http://www.space.com/35460-clingy-alien-planets-may-lose-moons.html

    Alien planets that orbit especially close to their stars have a bigger chance of losing their moons, which may reduce
    the chances that habitable alien moons will survive for very long around those planets, a new study finds.

    In the past 20 years or so, astronomers have confirmed the existence of more than 3,400 worlds outside Earth's solar system.
    These discoveries have revealed that many exoplanets are very different from those seen in Earth's solar system; for instance,
    about 40 percent of exoplanets discovered to date orbit their stars at least 10 times closer than Earth orbits the sun.
    (In comparison, Mercury is at most about three times closer than Earth is to the sun.)

    In Earth's solar system, there are far more moons than planets, with Jupiter alone having at least 67 moons. Previous work has
    suggested that exomoons, or moons around exoplanets, could be as big or larger than Earth. If an exoplanet happens to lie in
    a star's habitable zone — the area in which worlds have surface temperatures warm enough to host liquid water — then an Earth-
    size exomoon around such a planet could potentially harbor life.
    VIRGO
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    Objective: To deflect asteroids, thus preventing their collision with Earth | EurekAlert! Science News
    https://www.eurekalert.org/pub_releases/2017-01/snrc-otd012517.php

    An international project, led by Spain's National Research Council, (CSIC) provides information on the effects a projectile impact would have on an asteroid.
    The aim of the project is to work out how an asteroid might be deflected so as not to collide with the Earth. The research, published in The Astrophysical Journal,
    focuses on the study of the asteroid Chelyabinsk, which exploded over Russian skies in 2013 after passing through the atmosphere.

    The probability that a kilometre-sized asteroid could have devastating consequences after impact with the Earth is statistically small. What is more frequent,
    and repeatedly discovered, is that objects a few tens of meters across reach the Earth's atmosphere.

    The results of this study indicate that the composition, internal structure, density and other physical properties of the asteroid are "fundamental in
    determining the success of a mission in which a kinetic projectile would be launched to deflect the orbit of a dangerous asteroid."
    VIRGO
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    +2
    https://www.paulanthonywilson.com/...phere-transit-of-the-directly-imaged-exoplanet-beta-pictoris-b/

    This summer will be the first time that we’ll be able to observe the Hill sphere of a directly imaged exoplanet as it passes in
    front of its host star! The exoplanet, Beta Pictoris b, is a young (~20 million years old) planet orbiting the star beta Pictoris.

    As chance would have it, we see the orbit of beta Pic b (the exoplanet) nearly edge-on from Earth. This means that as beta Pic b
    moves along its orbit it will come very close to transiting the host star. Although the planet itself won’t pass exactly in front
    of it’s host star, the Hill sphere of beta Pic b will.

    During this event, any material in the Hill sphere (e.g. left-over debris from planet formation, rings, gas torus around satellites,
    etc.) could be detectable. This summer, my colleagues and I will monitor this transit event using the HST in the far-UV.

    This will be the first time that a Hill sphere of a directly imaged planet will be observed in the far-UV.
    The next such transit will not happen again for another 20 years!

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