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    USAHITMAN Conspiracy News
    Home»Science & Space»Is Jupiter Evil?

    Is Jupiter Evil?

    March 22, 20127 Mins Read
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    By Keith Cooper
    Discovery News

    Whilst most famous for his catalog of 110 galaxies, nebulae, clusters and double stars, Charles Messier was a comet-hunter at heart. His catalog was simply a list of nuisances, faint fuzzies that looked like comets but were not.

    The Frenchman found 13 comets in all between 1760 and 1785, but perhaps the most important of them was the streaking comet that he spotted in June 1770. Fast moving on the sky, it was bright enough at magnitude +2 that it could be clearly seen from well-lit towns and cities. A brief spectacle of wonder for eighteenth century astronomers to enjoy, its ramifications could have been much greater.

    The comet has since become known as Lexell’s Comet, after the Russian (yet Swedish born) astronomer Anders Johan Lexell who first calculated its orbit. He showed that the comet had made a close approach of just 2.2 million kilometers (0.015 AU), which is about six times the distance to the moon. It was the closest a comet has ever been witnessed to approach the Earth and, in astronomical terms, a very near (and fortunate) miss.

    Lexell found that the comet swooped around the sun with an orbital period of just under six years, but its next return in 1776 would see it on the far side of the sun, out of harm’s way. Sure enough, no astronomers found it again that year. In 1782 however, when again it was predicted to be visible, the comet was nowhere in sight.

    The French mathematician Pierre Simon-Laplace calculated that the comet had experienced a set of encounters with the giant planet Jupiter. The first saw Jupiter’s gravity modify the comet’s orbit to fling it almost onto a direct collision course with Earth. The second encounter modified the comet’s orbit, ejecting it from the solar system altogether and removing it as a potential hazard.

    Lexell is now a lost comet and Jupiter is the reason why nobody had ever seen it before 1770, and why no one ever saw it afterwards. In doing so, Jupiter played the role of both Earth’s friend and Earth’s foe.

    The story of Lexell’s Comet was pretty much forgotten in the decades and centuries that followed. By the 1960s astronomers looked upon long period comets — comets that hail from the Oort Cloud at the very edge of our solar system and which take many millennia to orbit the sun — as the major impact hazard to Earth.

    A general idea developed, bolstered by computer simulations performed in 1994 by the late George Wetherill of the Carnegie Institution, that dictated how Jupiter acted as Earth’s protector, sweeping up or ejecting many of the long period comets from the solar system and removing them from the population of potential impactors (Wetherill’s simulations coincided with comet Shoemaker–Levy 9 colliding with Jupiter). This idea has taken hold in established theory yet few have ever really questioned it until now.

    Realizing that today we know of many more short period comets and near-Earth asteroids that cross our planet’s orbit than long period comets, Jonathan Horner of the University of New South Wales, Sydney and Barrie Jones of the UK’s Open University have run new simulations that reveal a very different picture, one that has important consequences for the habitability of Earth and planets in general.

    “When George Wetherill did his work back in 1994, the computers available to him were much more limited than what we have today,” says Horner, who originally comes from the U.K. “The lack of computing power meant that he had to make some fairly big approximations and simplifications. His was a ground-breaking study but at the same time it was one that was limited by what he had available.”

    Horner and Jones decided to run the experiment again but this time with twenty-first century computing power, hooking up tens of computers in parallel at the Open University. Their simulations agreed that Jupiter is a factor in protecting Earth from long period comets, but how would it fare with the new populations of short period comets and near Earth asteroids? Described in a series of papers published in the International Journal of Astrobiology, the duo found their answer to be at odds with conventional theory.

    Gravitational Resonances

    Movies such as Armageddon and Deep Impact, combined with the common consensus that an asteroid strike 65 million years ago finished off the reign of the dinosaurs, has meant that the notion of asteroids hitting Earth is now part of our pop culture. These objects hail from the Asteroid Belt between Mars and Jupiter.

    While most asteroids move on stable orbits around the sun, neighboring Jupiter’s influence looms large and gravitational resonances between the planet and regions of the Asteroid Belt are adept at clearing out any rogue asteroids in these regions and sending them hurtling in-system. Often these rogues can originate from collisions between asteroids that send a shower of rocky chunks spinning off into these resonant zones.

    “The main thing that is driving material from the Asteroid Belt into the inner solar system is the influence of something called a secular resonance,” says Horner. “As things stand now in our solar system, this particular secular resonance is right at the inner edge of the asteroid belt.”

    In their simulations Horner and Jones played about with the mass of Jupiter, finding that the lower the planet’s mass, the broader the secular resonance becomes and the more it moves into the main body of the Asteroid Belt, closer to Jupiter, leading to more asteroids being perturbed.

    The simulations showed that the number of asteroid impacts on Earth peaks when there is a planet in Jupiter’s orbit that has a mass one-fifth that of Jupiter’s mass, whereas just over half the peak rate of impacts occur when there is a planet with a mass equal to Jupiter. The impact rate falls off again at the lower extreme, when Jupiter’s mass becomes too low to be able to nudge any asteroids with its gravity.

    A similar result, albeit for different reasons, arises when considering the impact rate of short period comets on Earth. Currently, Jupiter’s gravity is capable of throwing comets close to the Earth, as we saw with Lexell’s Comet, but it is also equally adept at cleaning up its mess and removing dangerous comets from the solar system.

    Were Jupiter only to have one-fifth of its real mass, the balance between hurling comets towards us and then removing them would be lost; Jupiter would still be able to destabilize comets and send them our way, but it would lose the ability to remove many of them.

    “If you have a low mass Jupiter, it is capable of placing things on Earth-crossing orbits but because it doesn’t have a big gravitational reach, once it has put a comet on an Earth-crossing orbit the comet can remain in that orbit for a very long time before it encounters Jupiter again,” says Horner.

    Better The Devil You Know?

    Jupiter’s role seems confused. It definitely sends asteroids and comets our way and, in any given year, more than 90 percent of all objects crossing Earth’s orbit are asteroids, so the protection Jupiter provides us from long period comets, or by eventually removing short period comets, is of lesser importance. Hence Jupiter is not the friend that it has been perceived to be.

    However, things could be far worse: were Jupiter to have a mere 20 percent of its mass, the impact rate would skyrocket. Obviously for any denizens on a planet in the target zone this is bad news, but in the grand scheme of things are impacts a positive or negative factor on the overall evolution of life on a planet across billions of years? When searching for potentially habitable exoplanets, should we seek to avoid systems that contain a 0.2 Jupiter-mass gas giant at a similar distance to Jupiter from the sun?

    Whether impacts have been a good thing or a bad thing for the evolution of life on Earth depends on who you talk to, says Dave Waltham, Head of the Earth Sciences Department at Royal Holloway, University of London. “What you can definitely say is that they cause some mass extinctions. Lots of people argue, however, that impacts can be good because they stir thing up and stop the biosphere from becoming stuck in a rut. Certainly for human beings, we wouldn’t be here if the dinosaurs hadn’t been wiped out.”

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    Evil Jupiter Space Universe
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