Announcement

Collapse
No announcement yet.

Impact ~ NEO; Near Earth Objects

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Originally posted by Bwaha View Post
    "The problem is, if it was an icy comet it would have had an obvious signature tail like other comets, and it would have been detected some significant time before the impact. We are actively looking for such things which is why we found the real asteroid that missed us, weeks ago."

    A response... http://blogs.nasa.gov/cm/blog/Watch%...308690869.html

    And as to the 'missing mass' the thing air-burst and scattered from how high???

    And you know that radioactive slag is quite different from a meteor...

    Come on buddy...
    The key point from Bwaha's link, which would apply also for a small comet;

    QUOTE:
    Even if we had been looking at the right spot and the right time, there is another problem -- the meteoroid would be in the daylit sky, and telescopes cannot see faint objects in the daytime.
    Simply put, the meteoroid was too small for the survey telescopes and came at us out of the Sun.

    Comment


    • Originally posted by Bwaha View Post
      "The problem is, if it was an icy comet it would have had an obvious signature tail like other comets, and it would have been detected some significant time before the impact. We are actively looking for such things which is why we found the real asteroid that missed us, weeks ago."

      A response... http://blogs.nasa.gov/cm/blog/Watch%...308690869.html
      Your response is pertinent to an asteroid but not to a comet. The water in a comet sublimates in the sunlight and leaves a classic comets tail which is relatively easy to detect.

      Originally posted by Bwaha View Post
      And as to the 'missing mass' the thing air-burst and scattered from how high???
      The Russians sent 20,000 rescue workers into the area and so far they have found essentially nothing. There should be chunks of melted rock and possibly craters lying about over 100 square mile area. Pieces and dust should be littering roads and parking lots. They should be lying on roof tops and on top of cars. Where is this missing debris? How can it only be a few small fragments near a hole in the ice?

      The explosion can not atomize the entire rock unless you invoke yet another miracle.

      Originally posted by Bwaha View Post
      And you know that radioactive slag is quite different from a meteor...

      Come on buddy...
      The slag is not necessarily radioactive after 50 years or so. Activation of the materials in the rock are caused by the neutron flux from a nuke, not the gamma rays which produce most of the radiation. Melted rocks within a fireball radius will not all become highly radioactive. If this was the case, the cities of Hiroshima and Nagasaki would still be a waste land today. In fact, they rebuilt right on top of ground zero (decades ago).

      The compositions of meteors vary wildly and are representative of the same materials that comprise the Earth and the rest of the planets. Even a scientist would be hard pressed to tell the difference.

      I don't live in a world of compounded miracles of coincidence and hand waving. I live in a world of factual scientific explanations. Hiding 10,000 tons of space rock is the task of a Magician working for the Russian Government, not Mother Nature.
      Last edited by Pirate-Drakk; 20 Feb 13, 18:25.
      Battles are dangerous affairs... Wang Hsi

      Comment


      • http://rt.com/news/meteorite-lake-chebarkul-urals-432/

        Come on...
        Credo quia absurdum.


        Quantum mechanics describes nature as absurd from the point of view of common sense. And yet it fully agrees with experiment. So I hope you can accept nature as She is - absurd! - Richard Feynman

        Comment


        • Even if they were pieces of a real meteor, there is no proof they were associated with the object that exploded. They could have come from a museum and been planted there by the government. These pieces are tiny and all 53, I suspect, would weigh less then 1 kg. You could probably carry them all in your pocket. 1 kg is ~1/10,000,000th of the mass claimed to have entered the atmosphere.

          So where is the missing 99.99999% of the asteroid? Abracadabra!

          From your link:
          “No, it definitely wasn’t a meteor. I don’t know what it was, but not that,” one local stated. “It was a stage for a missile. For sure!” another claimed.

          Should one just ignore the eye witness accounts when they don't agree with government reports coming from Moscow?
          Battles are dangerous affairs... Wang Hsi

          Comment


          • Originally posted by Pirate-Drakk View Post
            ...
            So where is the missing 99.99999% of the asteroid? Abracadabra!
            ...
            How foolish of me. The missing mass problem is solved. The asteroid was made of DARK MATTER!

            The universe is supposedly full of this stuff so why shouldn't a chunk hit the Earth now and again. It probably happens all the time, especially in Russia...
            Battles are dangerous affairs... Wang Hsi

            Comment


            • Originally posted by Pirate-Drakk View Post
              1 kg is ~1/10,000,000th of the mass claimed to have entered the atmosphere.

              So where is the missing 99.99999% of the asteroid? Abracadabra!

              You do realize that with the heat of reentry, a good portion of it would have been vaporised right ?

              In other words, there wouldn't be 10,000 Kg remaining of the meteor to hit the earth.
              Scientists have announced they've discovered a cure for apathy. However no one has shown the slightest bit of interest !!

              Comment


              • Well Drak, one of us is going to eat rook after this...

                Thankfully no-one has died from crow poisoning...

                Credo quia absurdum.


                Quantum mechanics describes nature as absurd from the point of view of common sense. And yet it fully agrees with experiment. So I hope you can accept nature as She is - absurd! - Richard Feynman

                Comment


                • Originally posted by tigersqn View Post
                  You do realize that with the heat of reentry, a good portion of it would have been vaporised right ?

                  In other words, there wouldn't be 10,000 Kg remaining of the meteor to hit the earth.
                  Yep. The Barringer Crater meteoroid is estimated to have been 150' in diameter, weighing 270,000 metric tons. Only a few fragments survived the entry into the Earth's atmosphere and the impact. A 10,000 kg (10 mt) meteoroid would have almost entirely vaporized prior to impact.
                  Watts Up With That? | The world's most viewed site on global warming and climate change.

                  Comment


                  • I'm still waiting for the forensic evidence.

                    But due to the lack of emp, its not a nuke...

                    Otherwise we'd not see the videos....

                    Any Russian care to mention the gold rush going on?

                    Good for those Capitalists...

                    That's the way to do it...
                    Last edited by Bwaha; 20 Feb 13, 20:17.
                    Credo quia absurdum.


                    Quantum mechanics describes nature as absurd from the point of view of common sense. And yet it fully agrees with experiment. So I hope you can accept nature as She is - absurd! - Richard Feynman

                    Comment


                    • Small and likely expended comet looks appealing. Consider they are presented as "dirty snowballs" though the "ice" can be other compounds besides H2O, like methane or similar frozen gases/liquids. After several passages around the Sun effervescing some of it's mass each time, eventually that comet is just a loosely packed pile of gravel, i.e. an asteroid.

                      This object was rather small and coming at Earth 'out of the Sun' which if combined with being a comet with little left to make a 'tail' would have been hard to observe in the first place. Compacted 'gravel' with some 'ice' inside as a core would explain why it began to leave a 'smokey trail' (steam and/or some other compounds burning), plus it started to break-up, then the compression forces and heat caused it to explode.

                      It's sounding very similar to the object involved in the Tunguska Blast of 1908, where the object supposedly left a 'smokey trail' in the sky, produced no crater, exploded in the air and left few findable 'meteorite' fragments.

                      Comment


                      • Originally posted by The Doctor View Post
                        ...
                        A 10,000 kg (10 mt) meteoroid would have almost entirely vaporized prior to impact.
                        While this may be correct, the "asteroid" was estimated to be 20,000,000 lb. = 10,000 tons.

                        You and TigerSqdn are off by three orders of magnitude in mass, which is a significant error. I am referring to an object supposedly 500 times more massive than what you are talking about.
                        http://www.nasa.gov/mission_pages/as...d20130215.html
                        Last edited by Pirate-Drakk; 21 Feb 13, 13:27.
                        Battles are dangerous affairs... Wang Hsi

                        Comment


                        • Originally posted by Pirate-Drakk View Post
                          While this may be correct, the "asteroid" was estimated to be 20,000,000 lb. = 10,000 tons.

                          You and TigerSqdn are off by three orders of magnitude in mass, which is a significant error. I am referring to an object supposedly 500 times more massive than what you are talking about.
                          http://www.nasa.gov/mission_pages/as...d20130215.html
                          The Barringer asteroid is estimated to have had a mass of 100,000 to 270,000 tons and it is likely that less than 1% of that mass has been recovered as meteorite fragments.
                          The current estimate of the recovered meteoritic iron mass is 30 tons (Nininger, 1949; Grady, 2000), although this is a highly uncertain number.

                          Asteroids smaller than Barringer tend not make big craters...

                          With regard to Barringer Crater and the projectile that produced it, there are two other observations worth noting. First, with a diameter of ~1 km, the crater approaches the lower limit of hypervelocity craters on Earth (Table 8.3). The atmosphere screens most objects that make smaller craters. That is, the atmosphere shields the surface from objects that are smaller or weaker.

                          Kring (2007)



                          The Chelyabinsk meteoroid had less than 10% of the mass of the Barringer asteroid. That coupled with the fact that it followed a very shallow trajectory is a pretty good indication that it should have mostly vaporized prior to impact, leaving little if any crater.
                          Watts Up With That? | The world's most viewed site on global warming and climate change.

                          Comment


                          • I'd really like to see map of the distribution of damage on the ground. That would give us means of estimating the area of damage which tells us the extent of the over-pressure. That would help discriminate between a large object at ~25 km altitude and a much smaller one which would have to be much closer to the ground.
                            Any metaphor will tear if stretched over too much reality.

                            Questions about our site? See the FAQ.

                            Comment


                            • Russian fireball largest ever detected by nuke monitoring organization

                              Published 25 February 2013

                              Infrasound has been used as part of the Comprehensive Nuclear Test Ban Treaty Organization’s (CTBTO) monitoring tools to detect atomic blasts since April 2001 when the first station came online in Germany. Infrasonic waves from the meteor that broke up over Russia’s Ural Mountains last week were the largest ever recorded by the CTBTO’s International Monitoring System.
                              More - http://www.homelandsecuritynewswire....g-organization

                              The CTBTO’s site is here - http://www.ctbto.org/press-centre/pr...sound-sensors/
                              Any metaphor will tear if stretched over too much reality.

                              Questions about our site? See the FAQ.

                              Comment


                              • Here's a short vid clip of a couple of 'small' comets currently being seen in southern hemisphere skies;
                                http://msnvideo.msn.com/?channelinde...e-c7ead13d69c4

                                Comment

                                Latest Topics

                                Collapse

                                Working...
                                X