Exista in sistemul solar o numaratoare inversa catre pierzanie

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Exista in sistemul solar o numaratoare inversa catre pierzanie?

Studii efectuate recent in cadrul Universitatii Cardiff sugereaza ca orbita sistemului nostru solar prin Calea Lactee intersecteaza traseele unor asteroizi de mari dimensiuni, ce ne-ar putea lovi oricand planeta.

Profesorul William Napier si Doctorul Janaki Wickramasinghe au ralizat simulari computerizate ale miscarii Soarelui prin bratul spiralat al Caii Lactee. Aceste modele au relevat o oscilatie regulata a astrului prin planul galactic central, acolo unde densitatea norilor de praf este cea mai ridicata. Si, cum sistemul solar reprezinta un obiect astral insemnat, aceasta sugereaza ca efectele lui gravitationale declanseaza abaterea multor comete inspre sine.

Multe dintre rocile care calatoresc in deriva prin spatiu intra in coliziune cu planetele sistemului nostru solar pe masura ce acesta se deplaseaza prin galaxie, inclusiv cu Pamantul. Craterele impacturilor inregistrate in toata lumea arata corelari cu cicluri de aproximativ 37 milioane de ani ale acestor calatorii prin planul galactic, intre care se numara si craterele impacturilor despre care se crede ca au pus capat vietii dinozaurilor cu doua cicluri in urma. Cifrele arata ca suntem din nou foarte aproape de o zona de periculozitate, unde riscul unui impact cu asteroizi creste de zece ori in cazul Pamantului. De zece ori mai mult decat foarte putin nu pare sa insemne prea mult, insa atunci cand riscul extinctiei este in chestiune, aceasta scara poate parea destul de ingrijoratoare.

A Genocidal Orbit? -The Solar System's Journey Through the Milky Way
Is there a genocidal countdown built into the motion of our solar system? Recent work at Cardiff University suggests that our system's orbit through the Milky Way encounters regular speedbumps - and by "speedbumps" we mean "potentially extinction-causing asteroids".

Professor William Napier and Dr Janaki Wickramasinghe have completed computer simulations of the motion of the Sun in our outer spiral-arm location in the Milky Way (image left of spiral arms).

These models reveal a regular oscillation through the central galactic plane, where the surrounding dust clouds are the densest. The solar system is a non-trivial object, so its gravitational effects set off a far-reaching planetoid-pinball machine which often ends with comets hurled into the intruding system.

The sun is about 26,000 light-years from the center of the Milky Way Galaxy, which is about 80,000 to 120,000 light-years across (and less than 7,000 light-years thick). We are located on on one of its spiral arms, out towards the edge. It takes the sun -and our solar system- roughly 200-250 million years to orbit once around the Milky Way. In this orbit, we are traveling at a velocity of about 155 miles/sec (250 km/sec).

Many of the ricocheted rocks collide with planets on their way through our system, including Earth. Impact craters recorded worldwide show correlations with the ~37 million year-cycle of these journeys through the galactic plane - including the vast impact craters thought to have put an end to the dinosaurs two cycles ago.

Almost exactly two cycles ago, in fact. The figures show that we're very close to another danger zone, when the odds of asteroid impact on Earth go up by a factor of ten. Ten times a tiny chance might not seem like much, but when "Risk of Extinction" is on the table that single order of magnitude can look much more imposing. Worse, Bruce Willis will only be available to save us for another fifty years at most. But you have to remember that ten times a very small number is still a very small number - and Earth has been struck by thousands of asteroids without any exciting extinction events. A rock doesn't just have to hit us, it has to be large enough to survive the truly fearsome forces that cause most to burn up on re-entry.

Professors Medvedev and Melott of the University of Kansas have a different theory based on the same regular motion. As the Sun ventures out "above" the galactic plane, it becomes increasingly exposed to the cosmic ray generating shock front that the Milky Way creates as it ploughs through space. As we get closer to this point of maximum exposure, leaving the shielding of the thick galactic disk behind, the Kansas researchers hold that the increasing radiation destroys many higher species, forcing another evolutionary epoch. This theory also matches in time with the dinosaur extinction - and it's nice to see theories for that from Kansas not based on "an angry bearded man in the sky did it".

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