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  1. #1411
    Nascar Pool Diecast Two Time Winner 4me2c's Avatar
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    Just saw this :

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    https://www.cbsnews.com/news/nasa-astronomers-active-galaxy-star-wars-tie-fighter-supermassive-black-hole/

  2. #1412
    Moderator at Work ilan's Avatar
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    Astronomy and the climate crisis: Scientists make some connections
    Chelsea Gohd, Space | 11 August 2020

    Climate change affects astronomy, and vice versa.


    In a new study, astronomers investigated the relationship between astronomy and climate change. (Image: © NASA)
    As astronomers look out to the universe, they use planet Earth as an important reference point. This has created a growing relationship between astronomy and the evolving study of climate change, which an international team of scientists explores in three new studies.

    Over the years, scientists have found an incredible variety of planets out in the cosmos, but none quite like Earth. But by studying far-off exoplanets, researchers can better understand our own planet (and vice versa.) So it's no surprise that astronomers are heavily involved in studying Earth's climate crisis. In these new studies, researchers examine how climate change is affecting astronomy and how the field is connected to the mounting global crisis.

    "As astronomers, we are immeasurably lucky to work in a fascinating field. With our unique perspective on the universe, it is our responsibility to communicate, inside and outside our community, about the disastrous consequences of anthropogenic climate change on our planet and our society," Faustine Cantalloube, a researcher at the Max Planck Institute for Astronomy (MPIA) and lead author of one of the new studies, said in a statement.

    For the new research, an international team of astronomers banded together to examine how climate change and astronomy interact — specifically, to see how astronomical observations are affected by climate change and how astronomy as a field contributes to the growing climate crisis.

    Venus: Lessons from a Climate Catastrophe:

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    https://videos.space.com/m/van6h0WA/venus-lessons-from-a-climate-catastrophe?list=9wzCTV4g
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  3. #1413
    Moderator at Work ilan's Avatar
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    'Giant impact' theory of moon's formation gets another boost
    Elizabeth Howell, SPACE | 24 September 2020

    Scientists have found yet more differences between Earth and moon rocks.


    Earth's moon is thought to have formed when a Mars-sized object, called Theia, slammed into the early Earth 4.4 billion years ago, blasting out material that later coalesced in to a large satellite as depicted in this artist's illustration.
    (Image: © NASA/JPL-Caltech)
    Scientists have found fresh evidence in lunar rocks showing that the moon was likely formed after a Mars-sized planet crashed into the proto-Earth more than 4 billion years ago.

    A NASA-led team examined moon rocks brought back to Earth by Apollo astronauts more than 50 years ago. Investigating the samples with advanced tools not available to researchers in the 1960s and 1970s, the team found further evidence of the "giant impact theory" by focusing on the amount and type of chlorine in the rocks, a new study reports.

    The researchers discovered the moon has a higher concentration of "heavy" chlorine compared to Earth, which sports more "light" chlorine. The terms "heavy" and "light" refer to versions of the chlorine atom, known as isotopes, that contain different numbers of neutrons in their nuclei.

    Shortly after the mammoth collision occurred, Earth was just able to stay together while pieces of both planets that were blasted into space coalesced to form the moon. Both of these blobby bodies had a mix of light and heavy chlorine isotopes at first, but that mix began to change as Earth's gravity pulled on the newly forming moon.

    As the cosmic bodies continued taking new shape after the crash, Earth tugged away the lighter chlorine toward itself, leaving the harder-to-move heavy chlorine on the moon. This left the moon depleted of lighter chlorine compared to the heavier isotope.

    "There’s a huge difference between the modern elemental makeup of the Earth and moon, and we wanted to know why," study co-author Justin Simon, a NASA planetary scientist, said in a statement. "Now, we know that the moon was very different from the start, and it's probably because of the 'giant impact' theory."

    The scientists also checked their understanding by looking at other elements that are halogens, in the same chemical family as chlorine. Other "light" halogens are also less abundant on the moon, and the team could not see any pattern that would suggest a later event caused the loss.

    The new study was published this month in the Proceedings of the National Academy of Sciences. It was led by Anthony Gargano, a graduate fellow at NASA's astromaterials research and exploration science division at the Johnson Space Center in Houston.

    The research adds to a growing mountain of chemical evidence to support the giant impact hypothesis, which was first suggested decades ago. For example, a study released in March of this year used high-precision measurements of oxygen isotopes to show that Earth and moon rocks are probably even more different from each other than previously thought.

    _______________________________________________

    From Science with a Twist, a video highlighting Moon formation theories:

    Last edited by ilan; 09-27-2020 at 11:43 AM.
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