• úvod
  • témata
  • události
  • tržiště
  • diskuze
  • nástěnka
  • přihlásit
    registrace
    ztracené heslo?
    VIRGOCosmos In Brief - Aktualní novinky vesmírného výzkumu v kostce
    VIRGO
    VIRGO --- ---
    Petr Kulhánek - Velké astronomické objevy za Velkou louží... (FČ FEL ČVUT 23.11.2017)
    https://www.youtube.com/watch?v=knZp8gCTw40
    VIRGO
    VIRGO --- ---
    2017 Nobel Prize Award Ceremony
    https://www.youtube.com/watch?v=cNWwGQAKidA
    VIRGO
    VIRGO --- ---
    Astronomers to Check Mysterious Interstellar Object for Signs of Technology - The Atlantic
    https://www.theatlantic.com/...ce/archive/2017/12/yuri-milner-oumuamua-interstellar-asteroid/547985/

    Russian billionaire Yuri Milner says if the space rock 'Oumuamua is giving off radio signals, his team
    will be able to detect them—and they may get the results within days.

    VIRGO
    VIRGO --- ---
    Earliest Black Hole Gives Rare Glimpse of Ancient Universe | Quanta Magazine
    https://www.quantamagazine.org/earliest-black-hole-gives-rare-glimpse-of-ancient-universe-20171206

    It weighs as much as 780 million suns and helped to cast off the cosmic Dark Ages. But now that astronomers
    have found the earliest known black hole, they wonder: How could this giant have grown so big, so fast?

    VIRGO
    VIRGO --- ---
    ESO to Build ELT With Full Primary Mirror | ESO Česko
    http://www.eso.org/public/czechrepublic/announcements/ann17085/

    ESO’s governing body, the Council, has just authorised additional spending to cover the cost of both the five inner rings of segments
    for the main mirror (M1) of the Extremely Large Telescope (ELT), and one spare set of 133 mirror segments (one sixth of the total M1),
    and also an additional mirror segment maintenance unit. The decision was made at the recent meeting of the Council in Garching, Germany,
    after the positive recommendation by the ESO Finance Committee and made possible by an improved funding scenario.

    VIRGO
    VIRGO --- ---
    Silicon Valley Astronomy Lecture Series: Jill Tarter, Oct. 11, 2017

    In 2004, Craig Venter & Daniel Cohen suggested that if the 20th century was the century of physics, the 21st century will be the century
    of biology on our planet. Jill Tarter believes that their idea will be extended beyond the surface of our world and that we may soon have
    the first opportunity to study biology that developed on other worlds. She talks about her vision of the future of understanding life on
    Earth and beyond our planet. And she discusses projects that are underway and are planned to learn more about the possibility of intelligent
    life among the stars. This talk also celebrates the publication of the book "Making Contact" (by Sarah Scoles) about Jill Tarter's life and work.

    Will the 21st Century be the Time we Discover Life Beyond Earth
    https://www.youtube.com/watch?v=wYcM0BOYHyw
    VIRGO
    VIRGO --- ---
    Heads Up, Earthlings! The Geminids Are Here | NASA
    https://www.nasa.gov/...shall/news/news/releases/2017/heads-up-earthlings-the-geminids-are-here.html

    2017 Geminids Will Be Dazzling!
    https://www.youtube.com/watch?v=LapXJCJFeXQ


    Fantastic Year for Geminid Meteor Shower - Sky & Telescope
    http://www.skyandtelescope.com/observing/geminid-shower-2017/

    Mark the date: December 13th. That's the night the Geminid meteor shower peaks. Highlighted by
    the return of its parent asteroid 3200 Phaethon, this year's show promises to be one of the best ever.

    VIRGO
    VIRGO --- ---
    The Initial Mass Functionsu201747 | www.cfa.harvard.edu/
    https://www.cfa.harvard.edu/news/su201747

    The gas and dust in giant molecular clouds gradually come together under the influence of gravity to form stars. Precisely how this occurs,
    however, is incompletely understood. The mass of a star, for example, is by far the most important factor constraining its future evolution,
    but astronomers do not clearly understand what determines the exact mass of a newly forming star. One aspect of this problem is simply knowing
    how many stars of each size there are, that is, knowing the distribution of stellar masses in a large cluster of stars. The initial mass function
    (IMF) describes this distribution, and is currently based on an average from observations of stars in our Milky Way.

    CfA astronomer Charlie Conroy and four colleagues are conducting a study of the IMF with the Keck telescope and its spectrometer. They do find
    some variations in the IMF and, contrary to some expectations, they conclude that metallicity is not the sole driver of these variations. Instead,
    they conclude that the velocities of the material in the star clusters seems to be a key factor. The result, which now will be followed up with
    more measurements, is important because it suggests a different theoretical framework is needed to explain the origin of the IMF.

    VIRGO
    VIRGO --- ---
    How strong are black holes really? — Shorthand Social
    https://social.shorthand.com/UFNews/uyeqsNATm8u/how-strong-are-black-holes-really

    UF scientists discover black holes' magnetism surprisingly wimpy

    Black holes are famous for their muscle: an intense gravitational pull known to gobble up entire stars and launch streams
    of matter into space at almost the speed of light.

    It turns out the reality may not live up to the hype.

    In a new paper appearing in the journal Science, University of Florida scientists have discovered these tears in the fabric
    of the universe have significantly weaker magnetic fields than previously thought.

    A 40-mile-wide black hole 8,000 light years from Earth named V404 Cygni yielded the first precise measurements of the magnetic
    field that surrounds the deepest wells of gravity in the universe. Study authors found the magnetic energy around the black hole
    is about 400 times lower than previous crude estimates.

    The measurements bring scientists closer to understanding how black holes' magnetism works, deepening our knowledge of how matter
    behaves under the most extreme conditions — knowledge that could broaden the limits of nuclear fusion power and GPS systems.

    The measurements also will help scientists solve the half-century-old mystery of how "jets" of particles traveling at nearly
    the speed of light shoot out of black holes’ magnetic fields, while everything else is sucked into their abysses, said study
    co-author Stephen Eikenberry, a professor of astronomy in UF’s College of Liberal Arts and Sciences.
    VIRGO
    VIRGO --- ---
    Galaxy Orbits in the Local Supercluster
    http://www.ifa.hawaii.edu/info/press-releases/galaxy_orbits/

    A team of astronomers from Maryland, Hawaii, Israel, and France has produced the most detailed map ever of the orbits of galaxies in
    our extended local neighborhood, showing the past motions of almost 1400 galaxies within 100 million light years of the Milky Way.

    The team reconstructed the galaxies' motions from 13 billion years in the past to the present day. The main gravitational attractor
    in the mapped area is the Virgo Cluster, with 600 trillion times the mass of the Sun, 50 million light years from us. Over a thousand
    galaxies have already fallen into the Virgo Cluster, while in the future all galaxies that are currently within 40 million light years
    of the cluster will be captured. Our Milky Way galaxy lies just outside this capture zone. However the Milky Way and Andromeda galaxies,
    each with 2 trillion times the mass of the Sun, are destined to collide and merge in 5 billion years.

    PANAAK
    PANAAK --- ---
    2017 Nobel Lectures in Physics
    https://www.youtube.com/watch?v=scVyxVnMYUc
    VIRGO
    VIRGO --- ---
    The PI’s Perspective: Wrapping up 2017 En Route to Our Next Flyby – Pluto New Horizons
    https://blogs.nasa.gov/...017/12/06/the-pis-perspective-wrapping-up-2017-en-route-to-our-next-flyby/

    New Horizons is in good health and cruising closer each day to its next encounter: a flyby of the Kuiper Belt object (KBO) 2014 MU69 (or “MU69” for short).
    If you follow our mission, you likely know that flyby will occur on New Year’s Eve and New Year’s Day 2019, which is just barely over a year from now!

    As I write this, New Horizons is wrapping up an active period that began when the spacecraft emerged from hibernation mode in September. But soon, on Dec. 21,
    we’ll put the spacecraft back in hibernation, where it will remain until June 4, 2018. After June 4 the spacecraft will stay “awake” until late in 2020, long
    after the MU69 flyby, when all of the data from that flyby have reached Earth.

    But before we put New Horizons into hibernation this month, we have some important work ahead. We’ll observe five more KBOs with the onboard LORRI telescope/
    imager to learn about their surface properties, satellite systems and rotation periods. This work is part of a larger set of observations of 25-35 Kuiper Belt
    objects from 2016 to 2020 on this extended mission. Learning about these KBOs from close range and at angles that we cannot observe from Earth makes will give
    us key context for the more detailed studies we’ll make of MU69 from a thousand times closer than we can study any other KBO. In addition to that LORRI imaging
    of these objects, we’re continuing our nearly round-the-clock observations of the charged particle and dust environment of the Kuiper Belt—both before and while
    New Horizons hibernates.

    Also right ahead is a 2.5-minute engine burn planned for Dec. 9 (yes, a Saturday). This maneuver will both refine our course and optimize our flyby arrival time
    at MU69, by setting closest approach to 5:33 Universal Time (12:33 a.m. Eastern Standard Time) on Jan. 1, 2019. Flying by at that time provides better visibility
    by the antennas of NASA’s Deep Space Network, which will attempt to reflect radar waves off the surface of MU69 for New Horizons to receive. If it succeeds, that
    difficult experiment will help us determine the surface reflectivity and roughness of MU69 at radar wavelengths—something that has been successfully applied to
    study asteroids, comets, planetary satellites and even some planets, including Pluto, which New Horizons observed the same way in 2015.

    VIRGO
    VIRGO --- ---
    Heavy Metal: How First Supernovae Altered Early Star Formation
    http://www.nersc.gov/...news/2017/heavy-metal-how-the-first-supernovae-altered-early-star-formation/

    New Research Bridges Scaling Gap Between Astrophysics and Cosmology

    In their respective efforts to understand the universe and all it comprises, there is a telling gap between what cosmologists and astrophysicists
    study and how they study it: scale. Cosmologists typically focus on the large-scale properties of the universe as a whole, such as galaxies and
    intergalactic medium; while astrophysicists are more interested in testing physical theories of small- to medium-sized objects, such as stars,
    supernovae and interstellar medium.

    And yet the two fields are more closely aligned than it might seem at first glance, especially when looking at how the early universe was formed.

    How First Supernovae Altered Early Star Formation
    https://www.youtube.com/watch?v=aO1p0zNYUy0
    VIRGO
    VIRGO --- ---
    VIRGO
    VIRGO --- ---
    Poetická Labuť za svítání
    (Ne že bych musel pastovat každý nosič či modul, někdy je to ale skutečná nádhera.)

    VIRGO
    VIRGO --- ---
    Research on clay formation could have implications for how to search for life on Mars
    https://theconversation.com/...tion-could-have-implications-for-how-to-search-for-life-on-mars-88507

    Today Mars has only a thin atmosphere, and its surface is very dry with the possible exception of some localised and temporary water seeps. However, ancient
    eroded valley networks that were discovered by orbiting spacecraft in the early days of exploration prove that water flowed across the surface in the remote past.

    Clay minerals cannot form unless there is water available – it is an essential ingredient in their microscopic crystalline structure. Clays are found virtually
    nowhere on the red planet except in Mars’s most ancient terrains, dating back to an epoch about 3.7-4.1 billion years ago, called the Noachian.

    On Earth, clay forms by weathering of mineral grains chemically attacked by water. Most scientists believe that a similar process took place on Mars during its wet,
    Noachian period. However, some researchers have suggested that most of the detected clay was not formed in this way at all. They argue instead it formed prior
    to that, while warm water was circulating through the bedrock in response to nearby volcanic and intrusive activity.

    VIRGO
    VIRGO --- ---
    Discovery about rare nitrogen molecules offers clues to makeup of other life-supporting planets | UCLA
    http://newsroom.ucla.edu/...trogen-molecules-offers-clues-to-makeup-of-other-life-supporting-planets

    team of scientists using a state-of-the-art UCLA instrument reports the discovery of a planetary-scale “tug-of-war” of life,
    deep Earth and the upper atmosphere that is expressed in atmospheric nitrogen.

    The Earth’s atmosphere differs from the atmospheres of most other rocky planets and moons in our solar system in that it is rich
    in nitrogen gas, or N2; the Earth’s atmosphere is 78 percent nitrogen gas. Titan, the largest of Saturn’s more than 60 moons, is
    the other body in our solar system with a nitrogen-rich atmosphere that resembles ours.

    Compared with other key elements of life — such as oxygen, hydrogen and carbon — molecular nitrogen is very stable. Two nitrogen
    atoms combine to form N2 molecules that stay in the atmosphere for millions of years.

    The majority of nitrogen has an atomic mass of 14. Less than one percent of nitrogen has an extra neutron. While this heavy isotope,
    nitrogen-15, is rare, N2 molecules that contain two nitrogen-15s — which chemists call 15N15N — are the rarest of all N2 molecules.

    The team of scientists measured the amount of 15N15N in air and discovered that this rare form of nitrogen gas is far more abundant
    than scientists had expected. The Earth’s atmosphere contains about two percent more 15N15N than can be accounted for by geochemical
    processes occurring near the Earth’s surface.

    “This excess was not known before because nobody could measure it,” said senior author Edward Young, a UCLA professor of geochemistry
    and cosmochemistry. “Our one-of-a-kind Panorama mass spectrometer allows us to see this for the first time. We conducted experiments
    showing that the only way for this excess of 15N15N to occur is by rare reactions in the upper atmosphere. Two percent is a huge excess.”

    Young said the enrichment of 15N15N in Earth’s atmosphere is a signature that’s unique to our planet. “But it also gives us a clue about
    what signatures of other planets might look like, especially if they are capable of supporting life as we know it.”
    VIRGO
    VIRGO --- ---
    Scientists observe supermassive black hole in infant universe | MIT News
    http://news.mit.edu/2017/scientists-observe-supermassive-black-hole-infant-universe-1206

    A team of astronomers, including two from MIT, has detected the most distant supermassive black hole ever observed.
    The black hole sits in the center of an ultrabright quasar, the light of which was emitted just 690 million years
    after the Big Bang. That light has taken about 13 billion years to reach us — a span of time that is nearly equal
    to the age of the universe.

    The black hole is measured to be about 800 million times as massive as our sun — a Goliath by modern-day standards
    and a relative anomaly in the early universe.

    VIRGO
    VIRGO --- ---
    Massive Primordial Galaxies Found Swimming in Vast Ocean of Dark Matter - National Radio Astronomy Observatory
    https://public.nrao.edu/news/2017-alma-galaxies-dark-matter/

    Astronomers expect that the first galaxies, those that formed just a few hundred million years after the Big Bang, would share many similarities with some of the dwarf
    galaxies we see in the nearby universe today. These early agglomerations of a few billion stars would then become the building blocks of the larger galaxies that came
    to dominate the universe after the first few billion years.

    Ongoing observations with the Atacama Large Millimeter/submillimeter Array (ALMA), however, have discovered surprising examples of massive, star-filled galaxies
    seen when the cosmos was less than a billion years old. This suggests that smaller galactic building blocks were able to assemble into large galaxies quite quickly.

    The latest ALMA observations push back this epoch of massive-galaxy formation even further by identifying two giant galaxies seen when the universe was only 780 million
    years old, or about 5 percent its current age. ALMA also revealed that these uncommonly large galaxies are nestled inside an even-more-massive cosmic structure, a halo
    of dark matter several trillion times more massive than the sun.

    The two galaxies are in such close proximity — less than the distance from the Earth to the center of our galaxy — that they will shortly merge to form the largest galaxy
    ever observed at that period in cosmic history. This discovery provides new details about the emergence of large galaxies and the role that dark matter plays in assembling
    the most massive structures in the universe.

    The researchers report their findings in the journal Nature.

    VIRGO
    VIRGO --- ---
    Clay minerals on Mars may have formed in primordial steam bath | News from Brown
    http://news.brown.edu/articles/2017/12/marsclay

    New research suggests that the bulk of clay minerals on Mars could have been formed as the planet’s crust
    cooled and solidified, not by later interactions with water on the surface as has long been assumed.

    Kliknutím sem můžete změnit nastavení reklam