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    VIRGOCosmos In Brief - Aktualní novinky vesmírného výzkumu v kostce
    VIRGO
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    1 odpověď+1
    https://solarsystem.nasa.gov/news/2017/04/10/10-things-april-10

    NASA will discuss new results about ocean worlds in our solar system from the agency's Cassini spacecraft and the Hubble Space Telescope
    during a news briefing at 11 a.m. PDT (2 p.m. EDT) on Thursday, April 13. Meanwhile, here are 10 things you need to know about ocean worlds

    VIRGO
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    The mystery of the dark bodies | Max Planck Society
    https://www.mpg.de/11225504/the-mystery-of-the-dark-bodies

    Black holes are not made up of matter, although they have a large mass. This explains why it has not yet been possible to observe them directly,
    but only via the effect of their gravity on the surroundings. They distort space and time and have a really irresistible attraction. It is hard
    to believe that the idea behind such exotic objects is already more than 230 years old.

    VIRGO
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    +2
    https://saturn.jpl.nasa.gov/news/2966/ring-grazing-orbits/

    In less than 24 hours, we’ll make our penultimate ring grazing,
    passing within 5 100 miles (8 200 km) of Saturn’s F ring.

    VIRGO
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    +5
    !!
    LEGO Ideas - James Webb Space Telescope
    https://ideas.lego.com/projects/172553

    VIRGO
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    +2
    https://www.nasa.gov/feature/jpl/solar-storms-can-drain-electrical-charge-above-earth

    New research on solar storms finds that they not only can cause regions of excessive electrical charge in the upper atmosphere above Earth's poles,
    they also can do the exact opposite: cause regions that are nearly depleted of electrically charged particles. The finding adds to our knowledge of
    how solar storms affect Earth and could possibly lead to improved radio communication and navigation systems for the Arctic.

    VIRGO
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    Astronomers discover new substellar companion using microlensing
    https://phys.org/news/2017-04-astronomers-substellar-companion-microlensing.html

    Using a gravitational microlensing technique, astronomers have detected a substellar companion of a host star
    in the system designated MOA-2012-BLG-006L. The new object is assumed to be a high-mass giant planet or a low-mass
    brown dwarf. The findings were presented in a paper published April 4 on the arXiv pre-print server.

    Based on the gravitational lens effect, the microlensing method is mainly used to detect planetary and stellar-mass
    objects regardless of the light they emit. This technique is therefore sensitive to the mass of the objects, rather
    than their luminosity, which allows astronomers to study objects that emit little or no light at all.

    The discovery of the microlensing event MOA-2012-BLG-006 was announced by the Microlensing Observations in Astrophysics
    (MOA) group on February 9, 2012. A few days later, the event was also detected by the Optical Gravitational Lensing
    Experiment (OGLE) and designated OGLE-2012-BLG-0022. Further observations of this event revealed the signal indicating
    the presence of a binary system, which was labeled MOA-2012-BLG-006L or OGLE-2012-BLG-0022L.

    VIRGO
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    New Horizons
    http://pluto.jhuapl.edu/News-Center/News-Article.php?page=20170410

    NASA's New Horizons spacecraft has eased into a long summer's nap,
    entering a hibernation phase on April 7 that will last until early September.

    VIRGO
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    Bright fireball over San Diego, California
    https://watchers.news/2017/04/11/bright-fireball-over-san-diego-california-april-2017/

    A very bright fireball was seen and recorded streaking through the night sky over San Diego, California around 04:00 UTC on April 11,
    2017 (21:00 PDT, April 10). Witnesses have described the event as green and very bright fireball, lasting for several seconds.

    20170410 meteor
    https://www.youtube.com/watch?v=Y-JEoZEQVBI
    VIRGO
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    University of Leicester astronomers discover Great ‘Cold’ Spot on Jupiter — University of Leicester
    http://www2.le.ac.uk/...versity-of-leicester-astronomers-discover-great-2018cold2019-spot-on-jupiter

    A second Great Spot has been discovered on Jupiter by University of Leicester astronomers, rivalling the scale of
    the planet’s famous Great Red Spot and created by the powerful energies exerted by the great planet’s polar aurorae.

    The ‘Great Cold Spot’ is comparable in size to the famous Great Red Spot, measuring up to 24 000 km in longitude and
    12 000 km in latitude. The phenomenon, only recently observed using the CRIRES instrument on the Very Large Telescope
    (VLT), may have existed for thousands of years.

    'Great Cold Spot' Discovered on Jupiter - University of Leicester
    https://www.youtube.com/watch?v=auDuqsulWYA
    VIRGO
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    Life could exist up to 10 kilometres beneath the sea floor | New Scientist
    https://www.newscientist.com/.../2127488-life-could-exist-up-to-10-kilometres-beneath-the-sea-floor/

    LIFE might eke out an existence far deeper inside Earth than we imagined. Samples from a mud volcano contain biological signatures
    that suggest microbes lived in the material when it was several kilometres beneath the ocean floor. “We might have a very big biosphere
    below our feet that’s very hard to get to,” says Oliver Plümper of Utrecht University in the Netherlands.

    Other researchers agree life could exist at such depths, but say the case is not yet proven. “They don’t have conclusive evidence,”
    says Rocco Mancinelli, an astrobiologist at NASA’s Ames Research Center, who studies life in extreme environments. Plümper’s team studied
    46 samples drilled from the South Chamorro mud volcano, near the deepest part of the ocean, the Mariana trench. Here, one tectonic plate
    slides under another. The heat and stress causes some of the material on the subducting plate to become a buoyant mineral called
    serpentinite that rises and erupts out of mud volcanoes.

    Examining the serpentinite in their samples, the team found chemicals usually produced by life, including amino acids and hydrocarbons.

    VIRGO
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    VIRGO
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    News | NASA News Briefing: Discoveries About Oceans Beyond Earth
    https://www.jpl.nasa.gov/news/news.php?release=2017-102

    NASA will discuss new results about ocean worlds in our solar system from the agency's Cassini spacecraft and HST
    during a news briefing 11 a.m. PDT (2 p.m. EDT) on Thursday, April 13. The event, to be held at NASA Headquarters
    in Washington, will include remote participation from experts across the country.

    The briefing will be broadcast live on NASA Television and the agency's website.

    These new discoveries will help inform future ocean world exploration -- including NASA's upcoming Europa Clipper
    mission planned for launch in the 2020s -- and the broader search for life beyond Earth.
    VIRGO
    VIRGO --- ---
    This morning has finished the 5th and final night of EHT observations at Pico Veleta. A real pleasure to have collaborated!

    8 telescopes in 6 locations in the EHT: Spain, Arizona, Chile, Mexico SouthPole, Hawaii. Two comprise multiple dishes.

    Light path: radio waves collected by IRAM dish, reflected by secondary mirror into receiver cabin & directed by more mirrors into receiver.

    JULIANNE
    JULIANNE --- ---
    +1
    Astrobiologie: Hranice živého a neživého - Kalendář akcí | Přírodovědci.cz
    https://www.prirodovedci.cz/kalendar-akci/astrobiologie-hranice-ziveho-a-neziveho
    VIRGO
    VIRGO --- ---
    +5
    Všechno nejlepší, Leone Kowalski! Replikant z Blade Runnera vznikl právě dnes | Wave News
    http://www.rozhlas.cz/...ejlepsi-leone-kowalski-replikant-z-blade-runnera-vznikl-prave-dnes--1717258

    VIRGO
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    +2
    Wave Clouds Over The Observatory On La Palma taken by Alan Fitzsimmons on April 9, 2017 @ La Palma, Canary Islands, Spain

    VIRGO
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    https://www.nasa.gov/press-release/goddard/2017/metal-mars

    Mars has electrically charged metal atoms (ions) high in its atmosphere, according to new results from NASA's MAVEN spacecraft.
    The metal ions can reveal previously invisible activity in the mysterious electrically charged upper atmosphere (ionosphere) of Mars.

    VIRGO
    VIRGO --- ---
    +1
    Astronomers take a closer look at a young circumbinary disk
    https://phys.org/news/2017-04-astronomers-closer-young-circumbinary-disk.html

    In a research paper published Apr. 3 on arXiv.org, astronomers presented a close-up view of the circumbinary disk HD 142527 obtained with the Atacama Large
    Millimeter and submillimeter Array (ALMA) in Chile. The new observations reveal the morphology and kinematics of the gas and dust emission in this disk.

    HD 142527 is a young binary system with an estimated age between 2 and 5 million years. Located some 510 light years away from the Earth, this binary is best
    known for its protoplanetary disk. The system's primary star has a mass of about 2.4 solar masses, while the secondary star, with an orbital radius between
    15 to 20 AU, is much less massive—from 0.1 to 0.3 solar masses.

    The binary is at the center of a large elliptical dust cavity of approximately 120 AU in radius and of an asymmetric disk with a dense dust crescent. The dust
    is visible up to an orbital radius of 300 AU and traces several spiral arcs. Moreover, the primary star appears to be surrounded by a much smaller dusty disk.

    Now, a team of astronomers led by Yann Boehler of the Rice University in Houston, Texas, has presented the results of new, more detailed ALMA observations of
    HD 142527, which uncover new insights into the nature of its disk.

    VIRGO
    VIRGO --- ---
    Lyrid meteor shower to peak April 22 | Astronomy Essentials | EarthSky
    http://earthsky.org/?p=158735

    The annual Lyrid meteor shower is active each year from about April 16 to 25. In 2017, the peak of this shower –
    which tends to come in a burst and usually lasts for less than a day – is expected to fall on the morning of April 22,
    with little or no interference from the slender waning crescent moon. The greatest number of meteors usually fall during
    the few hours before dawn. All in all the Lyrid meteor shower prospects look pretty good for 2017, though meteor showers
    are notorious for their fickle and not totally predictable nature! Follow the links below to learn more about April’s
    shooting stars!

    VIRGO
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    https://www.nasa.gov/image-feature/jpl/pia20529/plateaus-up-close

    Saturn’s C ring isn’t uniformly bright. Instead, about a dozen regions of the ring stand out as noticeably brighter than the rest of the ring,
    while about half a dozen regions are devoid of ring material. Scientists call the bright regions “plateaus” and the devoid regions “gaps.”

    Scientists have determined that the plateaus are relatively bright because they have higher particle density and reflect more light,
    but researchers haven’t solved the trickier puzzle of how the plateaus are created and maintained.

    This view looks toward the sunlit side of the rings from about 62 degrees above the ring plane. The image was taken Jan. 9, 2017 in green
    light with the Cassini spacecraft’s narrow-angle camera.

    Cassini obtained the image while approximately 194,000 miles (312,000 kilometers) from Saturn and at a Sun-Saturn-spacecraft, or phase,
    angle of 67 degrees. Image scale is 1.2 miles (2 kilometers) per pixel.

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