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  • The greatest danger asteroids pose to us is not from the impact

    EXCERPT:
    ...
    Wind kills. The most casualties from an asteroid impact won’t come from the impact itself. The wind, pressure and heat caused by the crash are far more dangerous, no matter where the asteroid hits.
    Clemens Rumpf at the University of Southampton, UK, and his colleagues have calculated the mortality risk, should an asteroid hit a residential area. They considered asteroids that burn up completely, those that hit the ground, and those that strike in water. Surprisingly, the airborne side effects were the ones that cost the most lives.
    As an asteroid hurtles towards the ground, it deposits a huge amount of energy into the atmosphere, resulting in a powerful shockwave, tornado-like winds and a plume of fire trailing behind it. When it crashes down, it forms a crater, shaking the ground around the impact and hurling debris into the air.

    If the asteroid hits water (which is twice as likely as hitting land), it would create a tsunami, with waves reaching dozens of metres high. The farther from shore the impact is, the deeper the water and the taller the waves.
    ...
    https://www.newscientist.com/article...om-the-impact/

    Comment


    • Lastest passage, update;
      Giant asteroid makes its closest approach to Earth

      http://www.msn.com/en-us/news/scienc...SXK?li=BBnbcA1

      Comment


      • Ancient stone carvings confirm how comet struck Earth in 10,950BC, sparking the rise of civilisations

        http://www.telegraph.co.uk/science/2...0950bc-wiping/

        Comment


        • Originally posted by G David Bock View Post
          Ancient stone carvings confirm how comet struck Earth in 10,950BC, sparking the rise of civilisations

          http://www.telegraph.co.uk/science/2...0950bc-wiping/
          The idea had been originally put forward by author Graham Hancock in his book Magicians of the Gods.
          I call bullshit.
          Hyperwar: World War II on the World Wide Web
          Hyperwar, Whats New
          World War II Resources
          The best place in the world to "work".

          Comment


          • Originally posted by OpanaPointer View Post
            I call bullshit.
            EXCERPT:
            Dr Martin Sweatman, of the University of Edinburgh’s School of Engineering, who led the research, said: "I think this research, along with the recent finding of a widespread platinum anomaly across the North American continent virtually seal the case in favour of (a Younger Dryas comet impact).
            "Our work serves to reinforce that physical evidence. What is happening here is the process of paradigm change.
            "It appears Göbekli Tepe was, among other things, an observatory for monitoring the night sky.
            “One of its pillars seems to have served as a memorial to this devastating event – probably the worst day in history since the end of the ice age.”
            .....
            Maybe you should have read further. Dr. Sweatman may disagree with you.

            Comment


            • Originally posted by G David Bock View Post
              EXCERPT:
              Dr Martin Sweatman, of the University of Edinburgh’s School of Engineering, who led the research, said: "I think this research, along with the recent finding of a widespread platinum anomaly across the North American continent virtually seal the case in favour of (a Younger Dryas comet impact).
              "Our work serves to reinforce that physical evidence. What is happening here is the process of paradigm change.
              "It appears Göbekli Tepe was, among other things, an observatory for monitoring the night sky.
              “One of its pillars seems to have served as a memorial to this devastating event – probably the worst day in history since the end of the ice age.”
              .....
              Maybe you should have read further. Dr. Sweatman may disagree with you.
              Appeal to authority. Gotcha.
              Hyperwar: World War II on the World Wide Web
              Hyperwar, Whats New
              World War II Resources
              The best place in the world to "work".

              Comment


              • Originally posted by OpanaPointer View Post
                Appeal to authority. Gotcha.
                More like did you actually read the full article and understand it.

                Comment


                • Originally posted by G David Bock View Post
                  More like did you actually read the full article and understand it.
                  atsdavidonthehead:
                  Hyperwar: World War II on the World Wide Web
                  Hyperwar, Whats New
                  World War II Resources
                  The best place in the world to "work".

                  Comment


                  • Originally posted by OpanaPointer View Post
                    atsdavidonthehead:
                    DECODING GÖBEKLI TEPE WITH ARCHAEOASTRONOMY: WHAT DOES THE FOX SAY?
                    http://maajournal.com/Issues/2017/Vo...017%281%29.pdf

                    Volume 17, Issue 1;
                    http://maajournal.com/Issues2017a.php

                    Last edited by G David Bock; 21 Apr 17, 14:42.

                    Comment


                    • Upcoming line-up ...
                      http://www.msn.com/en-us/video/wonde...ear/vi-BBBwPTk

                      One later at about 35,000 miles out ... that's a bit close.

                      Comment


                      • ..interesting subject here
                        ..it's hard to believe the power that some of these large ones could have on impact

                        We believe anything larger than one to two kilometers (one kilometer is a little more than one-half mile) could have worldwide effects. At 5.4 kilometers in diameter, the largest known potentially hazardous asteroid is Toutatis.

                        By comparison, asteroids that populate the main asteroid belt between Mars and Jupiter, and pose no threat to Earth, can be as big as 940 kilometers (about 583 miles) across.
                        worldwide effects?
                        https://www.nasa.gov/mission_pages/a...fastfacts.html

                        Comment


                        • Here's another article on what is a regular "threat" window, the Taurid Meteor Streams (TMS), which are connected with Comet Encke;
                          Earth Faces an Increased Risk of Being Hit by an Asteroid, Astronomers Warn

                          Large asteroids may be lurking undiscovered within a meteoroid stream whose particles are hitting Earth, and scientists are urging a concentrated search for them.
                          ...
                          Most of these particles are quite tiny and pose no threat whatsoever, but the Czech astronomers have tracked a new branch of the stream from which particles are intersecting with the planet. The branch includes two asteroids with diameters of between 200 and 300 meters (roughly 650-1000 feet). These asteroids are not themselves on a collision course with Earth, but their identification suggests that there may be other asteroids of this size or larger lurking undiscovered within this stream.

                          As such, the astronomers are urging a concentrated search for more Taurid asteroids, to see if any potentially threatening ones exist.
                          ...
                          https://www.seeker.com/space/astrono...tronomers-warn


                          The threat/danger of the TMS was raised about twenty years ago by Richard C. Hoagland in the following article/link. While some of this relates to "conspiracy theory' material of past and questionable concern, the middle part of the article provides interesting text and illustrations on the TMS and possible past historical impact events, such as following excerpt;
                          ...
                          Leading astronomers of the last half-century like Fred Whipple, Victor Clube, and William Napier have done extraordinary work pointing out that the Taurid stream seems to be the strung out remnants of a mega comet, an object at least several hundred kilometers in diameter which broke up only 20,000 years ago. The stream is thought to be lead by comet Encke, the shortest (3.3 years -- 1/10th 33 ..!) periodic comet known. The stream of debris orbits in an "Earth Crossing" elliptical pattern, a "tube" essentially 30 million kilometers wide. We cross this stream like clockwork twice a year, from June 24th through July 6th, and from November 3rd through November 15th. As you can see, we annually spend some 24 days in the grips of the Taurid's trail. Since the Earth's crossing time for most other meteor streams is just a few hours, volume for volume and mass for mass, the source object of the Taurid stream may be about a million times larger than a "typical" one.

                          In pointing out several periods of multiple impact events in the past (one coinciding with the construction of Stonehenge) due to a disturbance or fragmentation in the stream, Clube and Napier discern that there must be several massive "hidden" comets in the stream, dormant comets invisible to our telescopes buried in the dust and debris.

                          Whipple, for one, concurred. He pointed out that Encke, some 5 kilometers across, most probably had several dormant and even larger companions. In addition there have so far been two other comets identified in the stream and 13 Earth crossing asteroids.
                          ...
                          http://enterprisemission.com/oh_my_god.htm

                          A recent article also addresses the TMS and some archaeological evidence;

                          Stunning archaeological find vindicates renegade civilization historian Graham Hancock, author of “Magicians of the Gods”

                          https://newsflashus.com/stunning-arc...s-of-the-gods/

                          Comment


                          • NASA finds 10 'hazardous' asteroids near Earth...

                            Unexplained comet activity spike...

                            Comment


                            • A Giant Asteroid Will Come Extremely Close To Earth In 2029, And Impact ‘Can’t Be Ruled Out’

                              EXCERPT:


                              Scientists believe a 40-million-ton asteroid set to fly close to Earth in 12 years may end up colliding with our planet on a future pass.
                              The Apophis asteroid will pass within 18,600 miles of Earth on April 13, 2029, which is ridiculously close by space distance standards. Scientists expect the near-miss to disrupt the asteroid’s orbit, making its future path unpredictable.
                              This means there’s a small chance Apophis could hit Earth on a future pass. Apophis will pass by the Earth again in 2036.
                              “You can find a full table of objects for which the impact probability is not mathematically zero,” Dr. Richard P. Binzel, a planetary science professor at Massachusetts Institute of Technology (MIT) who’s involved in research on Apophis, told The Daily Caller News Foundation. “The table includes Apophis with a probability of 8.9e-6 (less than one chance in 100,000).”
                              ...
                              http://dailycaller.com/2017/06/26/a-...-be-ruled-out/


                              If the path is changed and unpredictable, can we be sure it comes back by in 2036?
                              Could return a bit sooner, or later ...

                              Comment


                              • Are asteroids humanity's 'greatest challenge'?

                                EXCERPT:

                                Throughout its 4.5-billion-year history, Earth has been repeatedly pummelled by space rocks that have caused anything from an innocuous splash in the ocean to species annihilation.

                                When the next big impact will be, nobody knows.

                                But the pressure is on to predict—and intercept—its arrival.

                                "Sooner or later we will get... a minor or major impact," Rolf Densing, who heads the European Space Operations Centre (ESOC) in Darmstadt, Germany, told AFP ahead of International Asteroid Day on Friday.

                                It may not happen in our lifetime, he said, but "the risk that Earth will get hit in a devastating event one day is very high."

                                For now, there is little we can do.

                                Read more at: https://phys.org/news/2017-06-astero...atest.html#jCp

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