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Supernova Detonation Aimed at Earth? Astronomers Say "Maybe"

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  • #31
    Don't read too well, hmmm?


    Bug up your ass, hmmmm? You realize that the mass of the star wasn't in the original article, right?

    Jwr = Ewr/d²/2s = 1.2e19s·Jsol/(7k·63k)²/2s for d in AU to compare to solar radiation reaching earth.
    Jwr = 6e18·Jsol/(441e6)² = 30.8 Jsol = 30.8·1400W/m² radiation reaching earth


    You're missing a factor of 4. The solid angle scales with pi*r_earth^2/(4*pi*d^2).

    And I did say order of magnitude.
    "Beware of the man who works hard to learn something, learns it, and finds himself no wiser than before. He is full of murderous resentment of people who are ignorant without having come by their ignorance the hard way. "
    -Bokonon

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    • #32
      BTW, since you're on a reading kick, the article said two minutes, not seconds.
      "Beware of the man who works hard to learn something, learns it, and finds himself no wiser than before. He is full of murderous resentment of people who are ignorant without having come by their ignorance the hard way. "
      -Bokonon

      Comment

      • #33
        Originally posted by chequita guevara View Post
        Actually, it's not the total destruction of the ozone layer, only 30% to 50% of it, but that would still be enough to make life on Earth unpleasant.

        Speaking of UV rays, I should go make Vitamin D with some.
        Exactly. Whitey (in general) could use some color. 'sides, it's just skin cancer.
        B♭3

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        • #34
          Originally posted by Ramo View Post
          Yes. Most science "journalism" isn't.
          Wait, this wasn't a joke post?
          B♭3

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          • #35
            "Beware of the man who works hard to learn something, learns it, and finds himself no wiser than before. He is full of murderous resentment of people who are ignorant without having come by their ignorance the hard way. "
            -Bokonon

            Comment

            • #36
              Physics fight

              Where's KH when you need him?
              You just wasted six ... no, seven ... seconds of your life reading this sentence.

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              • #37
                Stupid ****ing dps.
                You just wasted six ... no, seven ... seconds of your life reading this sentence.

                Comment

                • #38
                  Originally posted by Krill View Post
                  Physics fight

                  Where's KH when you need him?
                  Reading this:

                  Little Higgs Models and Their Phenomenology
                  http://arxiv.org/abs/hep-ph/0512128
                  This article reviews the Little Higgs models of electroweak symmetry breaking and their phenomenology. Little Higgs models incorporate a light composite Higgs boson and remain perturbative until a scale of order 10 TeV, as required by precision electroweak data. The collective symmetry breaking mechanism, which forms the basis of Little Higgs models, is introduced. An explicit, fully realistic implementation of this mechanism, the Littlest Higgs model, is then discussed in some detail. Several other implementations, including simple group models and models with T parity, are also reviewed. Precision electroweak constraints on a variety of Little Higgs models are summarized. If a Little Higgs model is realized in nature, the predicted new particles should be observable at the Large Hadron Collider (LHC). The expected signatures, as well as the experimental sensitivities and the possible strategies for confirming the Little Higgs origin of new particles, are discussed. Finally, several other related topics are briefly reviewed, including the ultraviolet completions of Little Higgs models, as well as the implications of these models for flavor physics and cosmology.


                  12-17-10 Mohamed Bouazizi NEVER FORGET
                  Stadtluft Macht Frei
                  Killing it is the new killing it
                  Ultima Ratio Regum

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                  • #39
                    WOW, WORKING 80 HRS A WEEK IS FUN! I SHOULD GO TO GRAD SCHOOL IN PHYSICS.

                    **** all of you.

                    12-17-10 Mohamed Bouazizi NEVER FORGET
                    Stadtluft Macht Frei
                    Killing it is the new killing it
                    Ultima Ratio Regum

                    Comment

                    • #40
                      If it weren't for the fact that I need to get a postgraduate diploma, I'd raise the opinion that I'm the smartest person on this forum for getting the hell out of academia after one degree.

                      That paper looks like a *****. Sucker...
                      You just wasted six ... no, seven ... seconds of your life reading this sentence.

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                      • #41
                        It's actually pretty friendly, since it's a review article.

                        I've never done any Little Higgs stuff, but I have to give a presentation on it in the "Topics in Advanced Particle Theory" class I'm taking. And I have to do a half-way decent job because:

                        a) My advisor has some decently-famous papers about it from ~ 6 years ago
                        b) The guy teaching the class is really famous and is on my thesis committee
                        12-17-10 Mohamed Bouazizi NEVER FORGET
                        Stadtluft Macht Frei
                        Killing it is the new killing it
                        Ultima Ratio Regum

                        Comment

                        • #42
                          Originally posted by KrazyHorse View Post
                          WOW, WORKING 80 HRS A WEEK IS FUN! I SHOULD GO TO GRAD SCHOOL IN PHYSICS.

                          **** all of you.

                          And not getting appreciated for it.

                          JM
                          Jon Miller-
                          I AM.CANADIAN
                          GENERATION 35: The first time you see this, copy it into your sig on any forum and add 1 to the generation. Social experiment.

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                          • #43
                            Originally posted by KrazyHorse View Post
                            It's actually pretty friendly, since it's a review article.

                            I've never done any Little Higgs stuff, but I have to give a presentation on it in the "Topics in Advanced Particle Theory" class I'm taking. And I have to do a half-way decent job because:

                            a) My advisor has some decently-famous papers about it from ~ 6 years ago
                            b) The guy teaching the class is really famous and is on my thesis committee
                            And that's the difference between an organic/inorganic chemist and a hardcore particle physics dude. If there aren't any pretty pictures it's not friendly.
                            You just wasted six ... no, seven ... seconds of your life reading this sentence.

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                            • #44
                              Originally posted by Straybow View Post
                              [Q=chequita guevara;5571831]Actually, it's not the total destruction of the ozone layer, only 30% to 50% of it, but that would still be enough to make life on Earth unpleasant.[/Q] First, only half the atmosphere will be bathed in gamma rays and lose UV protection. Annual regeneration of the south polar ozone hole in a few weeks shows that solar UV will rebuild the ozone layer in a short period of time. Longer than a few weeks because the polar region has a low angle of incidence, giving a longer path through the upper atmosphere than temperate regions and more O3 generation.

                              The EMP will be worse for civilization, but the human race will survive.
                              That doesn't take into account two things: one, that the lose of ozone we were worried about in the 90s was only about 5% of the ozone layer. Ten times that, while it might be repaired quickly (a few months to a year), would do a lot of damage.

                              Two, it doesn't take into account the high concentrations of nitric oxide (I think I got the right chemical) that would be created, which eats ozone.

                              It would make life unpleasant, it might kill lots of people, but it won't lead to mass extinction (especially of us). That's our job.
                              Christianity: The belief that a cosmic Jewish Zombie who was his own father can make you live forever if you symbolically eat his flesh and telepathically tell him you accept him as your master, so he can remove an evil force from your soul that is present in humanity because a rib-woman was convinced by a talking snake to eat from a magical tree...

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                              • #45
                                Originally posted by Krill View Post
                                And that's the difference between an organic/inorganic chemist and a hardcore particle physics dude. If there aren't any pretty pictures it's not friendly.
                                It's taken me under an hour to read the first 12 pages.

                                Unfortunately there's 60 pages total.

                                12-17-10 Mohamed Bouazizi NEVER FORGET
                                Stadtluft Macht Frei
                                Killing it is the new killing it
                                Ultima Ratio Regum

                                Comment

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