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  • #76
    P-D,

    You got a link for the geo map you lead off with? I'd like to look over a larger version. I'm wondering if something of the geological nature of the area had a hand in shaping that impact?

    And it sounds like you're looking for a "Doc" reply.

    Now if you want to look at some interesting shaped craters, you may wish to look over the images in this series of six articles, about Iapetus, a "moon" of Saturn's, which starts with this one (which I linked to earlier in this thread):
    http://www.enterprisemission.com/moon1.htm

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    • #77
      Originally posted by G David Bock View Post
      P-D,

      You got a link for the geo map you lead off with? I'd like to look over a larger version. I'm wondering if something of the geological nature of the area had a hand in shaping that impact?

      And it sounds like you're looking for a "Doc" reply.

      Now if you want to look at some interesting shaped craters, you may wish to look over the images in this series of six articles, about Iapetus, a "moon" of Saturn's, which starts with this one (which I linked to earlier in this thread):
      http://www.enterprisemission.com/moon1.htm
      I got the first pic from Doc's post above. Not sure what his source is but it's a good diagram.

      Iapetus is a real head scratcher. However, those craters are still round.

      One might explain the ridge line as due to differential cooling/shrinking of the core with respect to the surface. That ridge only goes half way around the moon as far as I can tell.

      Definitely odd and unlike any other object in the Solar System.
      Battles are dangerous affairs... Wang Hsi

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      • #78
        Here's the squarest looking craters I can find.

        This is a nuclear test site in Russia.




        This is a nuclear test site in Nevada.



        Even then, most of these underground blast sites are circular.

        Likewise, the two I have posted are not as square as the Barringer Crater.
        Attached Files
        Battles are dangerous affairs... Wang Hsi

        Comment


        • #79
          Originally posted by Pirate-Drakk View Post
          I got the first pic from Doc's post above. Not sure what his source is but it's a good diagram.

          Iapetus is a real head scratcher. However, those craters are still round.

          One might explain the ridge line as due to differential cooling/shrinking of the core with respect to the surface. That ridge only goes half way around the moon as far as I can tell.

          Definitely odd and unlike any other object in the Solar System.
          Right, guess I'll bug Doc on that.

          Try a closer look at some of those craters, definitely hexagon shaped. As for the equatorial ridge, looks like the other half may be covered over. A few other quirks about this planetoid, but it's late for me and I'll delve into them later.

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          • #80
            Square Craters

            NASA's NEAR Shoemaker spacecraft has spotted square-shaped craters on asteroid Eros, a telltale sign of mysterious goings-on in the asteroid belt long ago.


            September 26, 2000 -- In the pantheon of cosmic geometry, curves rule. Astronomy texts are filled with spiral galaxies, elliptical orbits, and ring nebulae. There are no chapters on triangles or rectangles -- after all, who ever heard of a square planet? Some of the simplest shapes, common in the handiwork of humans, are just plain rare in space.

            Rare, but not impossible...

            [...]

            An overzealous fan of Star Trek might mistake the impact scars for places where cube-shaped Borg vessels touched down and lifted off again, but scientists say they are natural -- albeit unusual -- features.

            "These square craters are not just novelties, they tell us something very interesting," says Andy Cheng of the Johns Hopkins University Applied Physics Laboratory. Cheng is the project scientist for NASA's Near Earth Asteroid Rendezvous spacecraft, which is orbiting Eros. "It's an indication that Eros is permeated with an extensive system of fractures and faults. Typically on Earth when we find this type of fractured area, the fractures form intersecting systems. Craters in such a terrain look square; we call them jointed craters. The best example is the Barringer Meteor Crater in Arizona."

            [...]

            NASA
            For a general explanation of the geology of Barringer Crater see: Guidebook to the Geology of Barringer Meteorite Crater, Arizona (a.k.a. Meteor Crater).

            For a more specific explanation of the squareness see: Shattered Earth or Fractured Past and Impact fracturing and structural modification of sedimentary rocks at Meteor Crater, Arizona.
            Watts Up With That? | The world's most viewed site on global warming and climate change.

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            • #81
              Originally posted by The Doctor View Post
              Thanks for the links Doc!
              Battles are dangerous affairs... Wang Hsi

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              • #82
                2 Small Asteroids Give Earth a Close Shave

                " The two asteroids were first detected over the weekend and quickly dismissed as potential impact threats to Earth. Their small size means they would likely not survive the fiery trip through Earth's atmosphere to reach the surface. "

                http://www.space.com/15043-small-ast...ose-shave.html

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                • #83
                  And another one;

                  A
                  steroid to buzz Earth Sunday
                  "An asteroid the size of a passenger jet will zoom close by Earth on Sunday just in time for April Fools' Day, but it has no chance of hitting the Earth, NASA says. The asteroid 2012 EG5 will be closer than the moon when it passes Earth at 5:32 a.m. EDT (0932 GMT). The space rock is about 150 feet wide, according to a NASA update.
                  "Asteroid 2012 EG5 will safely pass Earth on April 1," scientists with NASA's Asteroid Watch program at the Jet Propulsion Laboratory in Pasadena, Calif., wrote in a Twitter statement.
                  The space rock may be visiting Earth on April Fools' Day, but its flyby is no prank. The asteroid will creep within 143,000 miles of Earth during its closest approach, which is just over half the distance between Earth and the moon's orbit. The moon typically circles the Earth at a distance of 238,000 miles.
                  Asteroid 2012 EG5 is the third relatively small asteroid to buzz the Earth in seven days. Two smaller asteroids passed near Earth on March 26.

                  ....
                  Asteroid 2012 EG5 was discovered on March 13 by astronomers searching for near-Earth space rocks. Another space rock, the asteroid 2012 FA57, was discovered on March 28 and will fly by Earth on April 4 when it passes at a range just beyond the orbit of the moon. "
                  http://www.msnbc.msn.com/id/46914188

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                  • #84
                    Another one zooming by tomorrow, Thursday and this one is a recent discovery;
                    Huge asteroid to fly by Earth Thursday: How to watch online

                    EXCERPT:
                    An asteroid the size of a city block is set to fly by Earth Thursday, and you may be able to watch it happen live.

                    The near-Earth asteroid 2012 LZ1, which astronomers think is about 1,650 feet wide, will come within 14 lunar distances of Earth Thursday evening. While there's no danger of an impact on this pass, the huge space rock may come close enough to be caught on camera.

                    That's what the team running the Slooh Space Camera thinks, anyway. The online skywatching service will train a telescope on the Canary Islands on 2012 LZ1 and stream the footage live, beginning at 8:00 p.m. EDT Thursday (0000 GMT Friday).

                    You can watch the asteroid flyby on Slooh's website, found here: http://events.slooh.com/


                    http://www.msnbc.msn.com/id/47805799/ns/technology_and_science-space/

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                    • #85
                      Another one passing by

                      Go online to watch big asteroid zoom past our planet

                      Skywatching website to monitor 2002 AM31's flyby on Sunday; no threat to Earth

                      A city-block size asteroid will fly by Earth this weekend, well beyond the orbit of the moon, and you can watch it zip safely by live in an online webcast.
                      The asteroid 2002 AM31 will make its closest approach to Earth on Sunday, when it will pass by at a range of about 3.2 million miles (5.2 million kilometers). That's about 13.7 times the distance between Earth and the moon.

                      ...
                      http://www.msnbc.msn.com/id/48262053.../#.UAsbHKCvmWc

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                      • #86
                        Recent and rather close;
                        Whoa! Earth gets close shave by newfound asteroid

                        EXCERPT:

                        The near-Earth asteroid 2012 XE54, which was discovered Sunday, came within 140,000 miles (230,000 kilometers) of our planet at about 5 a.m. EST Tuesday, researchers said. For comparison, the moon orbits Earth at an average distance of 240,000 miles or so (386,000 km).
                        Astronomers estimate that 2012 XE54 is about 120 feet (36 meters) wide — big enough to cause substantial damage if it slams into Earth someday. An object of similar size flattened 800 square miles (2,000 square km) of forest when it exploded above Siberia's Podkamennaya Tunguska River in 1908.

                        ...
                        http://www.msnbc.msn.com/id/50165912...4#.UMfbE2f5nTp

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                        • #87
                          Since underground nuclear explosions are conducted in specially constructed deep chambers, and thus representing the collapse of not only the chamber itself but the strata surrounding the chamber, can they be validly compared to craters created by surface impacts of non-explosive solid objects?
                          Quis Custodiet Ipsos Custodes? Who is watching the watchers?

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                          • #88
                            Asteroid Toutatis Tumbles by Earth: Images and Videos
                            “Toutatis appears to have a complicated internal structure,” said radar team member Michael Busch of the National Radio Astronomy Observatory. “Our radar measurements are consistent with the asteroid’s little lobe being ~15% denser than the big lobe; and they indicate 20% to 30% over-dense cores inside the two lobes.”
                            Read more: http://www.universetoday.com/98955/a...#ixzz2EtIsy3bV
                            Any metaphor will tear if stretched over too much reality.

                            Questions about our site? See the FAQ.

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                            • #89
                              Asteroid Apophis to pass near Earth on Wednesday

                              QUOTE:
                              ...
                              If it ever hit Earth, the asteroid would deliver an impact blast on land of 141 megatons, almost three times stronger than the biggest H-bomb ever tested, according to Purdue University's impact calculator.
                              "Due to the proximity of its orbit to Earth, Apophis is being considered as a potential target for both robotic and crewed spacecraft missions," the JPL statement notes
                              ....
                              http://www.usatoday.com/story/tech/s...-2013/1818045/

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                              • #90
                                Asteroid Deflection Mission Seeks Smashing Ideas

                                Jan. 15, 2013 — A space rock several hundred metres across is heading towards our planet and the last-ditch attempt to avert a disaster -- an untested mission to deflect it -- fails. This fictional scene of films and novels could well be a reality one day. But what can space agencies do to ensure it works?


                                http://www.sciencedaily.com/releases...0115092828.htm
                                Any metaphor will tear if stretched over too much reality.

                                Questions about our site? See the FAQ.

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