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    WeatherToday

    @WeatherToday

    Astronomer

    I love studying weather and giving heads up for severe weather and making sure everyone is safe during storms.

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    Website www.patreon.com/WeatherToday Location Florida Age 21

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    Latest posts made by WeatherToday

    • Astronomers spot one of the oldest stars in the entire universe!!

      And the 13.5-billion-year-old red dwarf just so happens to reside right here in the Milky Way.

             One of the oldest stars in the universe is quietly hiding out in the Milky Way some 2,000 light-years from Earth. 
      

      According to a new study published in The Astrophysical Journal, the tiny, 13.5-billion-year-old red dwarf contains barely any heavy elements at all, suggesting it formed out of a nearly pristine cloud of material left over from shortly after the Big Bang. Furthermore, because the small star is just one-seventh the mass of the Sun and is made of primordial matter, it’s making astronomers reconsider the demographics of the very first stars.

      Ancient ancestors

      The first stars to form in the universe likely flicked on around 200 million years after the Big Bang. These early stars were forged out of the material that was available to them at the time — mostly hydrogen, some helium, and a touch of lithium.

      As these stars lived out their lives, they converted their starter elements into progressively heavier elements, which astronomers call “metals.” Eventually, some of these early stars exploded as supernovae, which spewed their trapped metals out into the cosmos. Then, the next batch of stars formed from the resulting, slightly metal-enhanced clouds. On and on this went, with each successive generation of stars enriching the next with more and more metals.

      “Our Sun likely descended from thousands of generations of short-lived massive stars that have lived and died since the Big Bang,” said lead author Kevin Schlaufman of Johns Hopkins University in a press release. “However, what’s most interesting about this star is that it had perhaps only one ancestor separating it and the beginnings of everything.”

      It’s small. So what?

      Although finding a star that’s been around since shortly after the Big Bang is undoubtedly fascinating, the small stature of the old, metal-poor star (succinctly named 2MASS J18082002-5104378 B) is equally intriguing.

      In general, astronomers think the universe’s first stars were extremely massive and lived quite short lives. In fact, until the late 1990s, many researchers thought that the early universe could only form massive stars.

      But that view has slowly evolved over the years as simulations have become increasingly sophisticated. For example, a Japanese study in 2012 carried out simulations that showed the formation of low-mass stars in the early universe could potentially be triggered by nearby supernova explosions.

      Although astronomers are not exactly sure how tiny 2MASS J18082002-5104378 B formed, “this discovery tells us that the very first stars in the universe didn’t have to all be massive stars that died long ago,” said astrophysicist Andrew Casey of Monash University to ScienceAlert. “These ancient stars could form from very small amounts of material, which means some of those relics from soon after the Big Bang could still exist today. That gives us a new viewpoint for star formation in the early universe!”

                           By Jake Parks  |  Published: Wednesday, November 07, 2018 
      

      http://www.astronomy.com/news/2018/11/red-dwarf-is-one-of-the-oldest-in-the-universe

      posted in General Discussion
      WeatherTodayW
      WeatherToday
    • RE: How about adding fronts as a type of model?

      @siim Thanks for the Link to the article

      posted in Your Feedback and Suggestions
      WeatherTodayW
      WeatherToday
    • How about adding fronts as a type of model?

      We can use fronts and see where low pressures and high pressures as well as cold fronts, warm fronts, and dry lines that can very well help him prove to model for people wanting to help with predicting storms or something of that nature. Like these below.

      0_1541680731739_main-qimg-6f507060214b4d9c266e0c096ac553c3-c.jpeg

      posted in Your Feedback and Suggestions
      WeatherTodayW
      WeatherToday
    • Mysterious interstellar object floating in space might be alien, say Harvard researchers

      It's been dubbed a comet, an asteroid, and a new class of interstellar object. Now, a paper from Harvard astronomers suggests one more possibility into the mysterious object nicknamed "Oumuamua": Alien probe.

      Researchers focused on whether solar radiation pressure could explain the unusual acceleration of "Oumuamua," the first object entering the Earth's solar system from interstellar space.

      The paper said if solar radiation pressure is the reason "Oumuamua" is moving at high speeds, it represents "a new class of thin interstellar material" either made naturally or through artificial means.

      The paper's authors, which include Avi Loeb, chair of Harvard's astronomy department, suggest the object could be a "light sail" used to propel spacecraft with solar energy.

      The other possibility? It comes from aliens. "A more exotic scenario is that 'Oumuamua'
      may be a fully operational probe sent intentionally to Earth vicinity by an alien civilization,"

                    USA TODAY NETWORKBrett Molina, USA TODAY Published 8:03 a.m. ET Nov. 6, 2018 | Updated 3:41 p.m. ET Nov. 6, 2018
      
      posted in General Discussion
      WeatherTodayW
      WeatherToday