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Thread: Astronomy

  1. #1876
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    The SOCIETY for POPULAR ASTRONOMY

    Electronic News Bulletin No. 456 2017 November 5

    FRESH FINDINGS FROM CASSINI
    NASA

    The Cassini spacecraft ended its journey on Sept. 15 with an intentional
    plunge into the atmosphere of Saturn, but analysis continues on the
    mountain of data the spacecraft sent during its long 'life'. The
    spacecraft's Ion and Neutral Mass Spectrometer (INMS) returned a lot
    of direct measurements of the components in Saturn's upper atmosphere,
    which stretches almost to the rings. From those observations, the team
    sees evidence that molecules from the rings are raining down onto the
    atmosphere. That influx of material from the rings was expected, but
    INMS data show hints of ingredients more complex than just water, which
    makes up the bulk of the rings' composition. In particular, the
    instrument detected methane, a volatile molecule that scientists would
    not expect to be abundant in the rings or found so high in Saturn's
    atmosphere.

    Chief among the questions that scientists hope to answer by using data
    from Cassini is the age and origin of the rings. Theoretical modelling
    has shown that, without forces to confine them, the rings would spread
    out over hundreds of millions of years -- much younger than Saturn
    itself. Such spreading happens because faster-moving particles that
    orbit closer to Saturn occasionally collide with slower particles on
    slightly farther-out orbits. When that happens, some momentum from the
    faster particles is transferred to the slower particles, speeding the
    latter up in their orbit and causing them to move farther out. The
    inverse happens to the faster, inner particles. Previous research had
    shown that gravitational tugs from the moon Mimas are solely responsible
    for halting the outward spread of Saturn's B ring -- that ring's outer
    edge is defined by the dark region known as the Cassini Division. Ring
    scientists had thought that the small moon Janus was responsible for
    confining the outer edge of the A ring, but a new modelling study shows
    that the A ring's outward creep is kept in check by a confederation of
    moons, including Pan, Atlas, Prometheus, Pandora, Janus, Epimetheus and
    Mimas.

  2. #1877
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    The SOCIETY for POPULAR ASTRONOMY

    Electronic News Bulletin No. 456 2017 November 5

    FRESH FINDINGS FROM CASSINI
    NASA

    The Cassini spacecraft ended its journey on Sept. 15 with an intentional
    plunge into the atmosphere of Saturn, but analysis continues on the
    mountain of data the spacecraft sent during its long 'life'. The
    spacecraft's Ion and Neutral Mass Spectrometer (INMS) returned a lot
    of direct measurements of the components in Saturn's upper atmosphere,
    which stretches almost to the rings. From those observations, the team
    sees evidence that molecules from the rings are raining down onto the
    atmosphere. That influx of material from the rings was expected, but
    INMS data show hints of ingredients more complex than just water, which
    makes up the bulk of the rings' composition. In particular, the
    instrument detected methane, a volatile molecule that scientists would
    not expect to be abundant in the rings or found so high in Saturn's
    atmosphere.

    Chief among the questions that scientists hope to answer by using data
    from Cassini is the age and origin of the rings. Theoretical modelling
    has shown that, without forces to confine them, the rings would spread
    out over hundreds of millions of years -- much younger than Saturn
    itself. Such spreading happens because faster-moving particles that
    orbit closer to Saturn occasionally collide with slower particles on
    slightly farther-out orbits. When that happens, some momentum from the
    faster particles is transferred to the slower particles, speeding the
    latter up in their orbit and causing them to move farther out. The
    inverse happens to the faster, inner particles. Previous research had
    shown that gravitational tugs from the moon Mimas are solely responsible
    for halting the outward spread of Saturn's B ring -- that ring's outer
    edge is defined by the dark region known as the Cassini Division. Ring
    scientists had thought that the small moon Janus was responsible for
    confining the outer edge of the A ring, but a new modelling study shows
    that the A ring's outward creep is kept in check by a confederation of
    moons, including Pan, Atlas, Prometheus, Pandora, Janus, Epimetheus and
    Mimas.

  3. #1878
    On the road, but not! Danik 2016's Avatar
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    Interesting article:

    "Building on Dawn's findings, the team has
    hypothesized that water vapour may be produced in part from energetic
    particles from the Sun interacting with ice at shallow depths in Ceres'
    surface."
    That seems to me to be the most important aspect of the mission. Another concern is the composition of Ceres.
    "You can always find something better than death."
    Jacob and Wilhelm Grimm, The Bremen Town Musicians

  4. #1879
    On the road, but not! Danik 2016's Avatar
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    Quote Originally Posted by Dreamwoven View Post
    The SOCIETY for POPULAR ASTRONOMY

    Electronic News Bulletin No. 456 2017 November 5

    FRESH FINDINGS FROM CASSINI
    NASA

    The Cassini spacecraft ended its journey on Sept. 15 with an intentional
    plunge into the atmosphere of Saturn, but analysis continues on the
    mountain of data the spacecraft sent during its long 'life'. The
    spacecraft's Ion and Neutral Mass Spectrometer (INMS) returned a lot
    of direct measurements of the components in Saturn's upper atmosphere,
    which stretches almost to the rings. From those observations, the team
    sees evidence that molecules from the rings are raining down onto the
    atmosphere. That influx of material from the rings was expected, but
    INMS data show hints of ingredients more complex than just water, which
    makes up the bulk of the rings' composition. In particular, the
    instrument detected methane, a volatile molecule that scientists would
    not expect to be abundant in the rings or found so high in Saturn's
    atmosphere.

    Chief among the questions that scientists hope to answer by using data
    from Cassini is the age and origin of the rings. Theoretical modelling
    has shown that, without forces to confine them, the rings would spread
    out over hundreds of millions of years -- much younger than Saturn
    itself. Such spreading happens because faster-moving particles that
    orbit closer to Saturn occasionally collide with slower particles on
    slightly farther-out orbits. When that happens, some momentum from the
    faster particles is transferred to the slower particles, speeding the
    latter up in their orbit and causing them to move farther out. The
    inverse happens to the faster, inner particles. Previous research had
    shown that gravitational tugs from the moon Mimas are solely responsible
    for halting the outward spread of Saturn's B ring -- that ring's outer
    edge is defined by the dark region known as the Cassini Division. Ring
    scientists had thought that the small moon Janus was responsible for
    confining the outer edge of the A ring, but a new modelling study shows
    that the A ring's outward creep is kept in check by a confederation of
    moons, including Pan, Atlas, Prometheus, Pandora, Janus, Epimetheus and
    Mimas.
    That´s a new idea for me, that Saturns rings are kept in check by moons. The universe has its own balance.
    "You can always find something better than death."
    Jacob and Wilhelm Grimm, The Bremen Town Musicians

  5. #1880
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    On a similar theme - Hubble has discovered a dozen previously unknown moons going round Jupiter:

    See Astronomy Now.

    Astronomers searching for a hypothesised large planet in the outer Solar System far beyond Pluto stumbled across 12 previously undetected moons orbiting Jupiter, pushing the giant planet’s total to a record 79.

  6. #1881
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    See Astronomy Now

    Astronomers searching for a hypothesised large planet in the outer Solar System far beyond Pluto stumbled across 12 previously undetected moons orbiting Jupiter, pushing the giant planet’s total to a record 79.

  7. #1882
    On the road, but not! Danik 2016's Avatar
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    79 moons is quite a lot. But it definitely takes away the romantic aura of this heavenl body.
    "You can always find something better than death."
    Jacob and Wilhelm Grimm, The Bremen Town Musicians

  8. #1883
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    On a similar theme - Hubble has discovered a dozen previously unknown moons going round Jupiter:

    From: Astronomy Now <[email protected]>
    Subject: 12 new moons found orbiting Jupiter
    Date: 17 July 2018 at 20:07:44 GMT+2
    Reply-To: Astronomy Now <[email protected]>

  9. #1884
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    The James Webb Telescope keeps getting postponed. Today the next postponement was announced. See https://www.universetoday.com/139620...nt-gas-giants/

  10. #1885
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    So the Hubble Telescope remains the main space telescope we have.

  11. #1886
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    The James Webb Space telescope will be concentrating on examining variations in planets that have some kind of atmosphere, to ascertain what its potential will be for its suitability to support life.

  12. #1887
    Registered User tailor STATELY's Avatar
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    Saw a short on the James Webb Space telescope on NOVA last night. It has nearly 2 ounces of gold on its receiver as a coating 600 atoms thick ! Must be nightmare to calibrate.

    Ta ! (short for tarradiddle),
    tailor STATELY
    tailor

    who am I but a stitch in time
    what if I were to bare my soul
    would you see me origami

    7-8-2015

  13. #1888
    On the road, but not! Danik 2016's Avatar
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    "The James Webb Space Telescope is like the party of the century that keeps getting postponed. Due to its sheer complexity and some anomalous readings that were detected during vibration testing, the launch date of this telescope has been pushed back many times – it is currently expected to launch sometime in 2021."

    I think it must be a money matter too. I somehow have the, maybe wrong idea, that NASA is doing less research this year.
    "You can always find something better than death."
    Jacob and Wilhelm Grimm, The Bremen Town Musicians

  14. #1889
    On the road, but not! Danik 2016's Avatar
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    Her is a bit more about the 12 Jupiter moons:

    https://www.skyandtelescope.com/astr...-79-now-known/
    "You can always find something better than death."
    Jacob and Wilhelm Grimm, The Bremen Town Musicians

  15. #1890
    On the road, but not! Danik 2016's Avatar
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    Astronaut news!

    NASA Will Announce Commercial Crew Astronaut Picks

    "Boeing's Starliner and SpaceX's Crew Dragon spacecraft will soon have their first riders: NASA plans to announce on Aug. 3 the astronauts assigned to the test flights and maiden voyages of the agency's commercial crew program.

    NASA will air the event live from Johnson Space Center (JSC) in Houston starting at 11 a.m. EDT (1500 GMT), where NASA Administrator Jim Bridenstine will introduce the astronauts. JSC Director Mark Geyer and Kennedy Space Center Director Bob Cabana, as well as representatives from SpaceX and Boeing, will also be involved, NASA officials said in a statement. The program will reveal the astronauts assigned to each of the companies' crewed test flights and their first missions to the space station, which will all launch from Kennedy Space Center in Florida."
    https://www.space.com/41288-nasa-wil...stronauts.html
    "You can always find something better than death."
    Jacob and Wilhelm Grimm, The Bremen Town Musicians

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