Website review: Cataclysmic Clockwork -Our Solar Sy...
TapwaterJ discovered this in Science/Tech
•4 reviews since May 7, 2008
science
•dailygalaxy.com/my_weblog/2008/05/cataclysmic...
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TapwaterJ discovered 2 months ago
Cataclysmic Clockwork Our Solar System's Deadly Orbit Through the Milky Way The Daily Galaxy, Luke McKinney- "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.
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 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."
Asteroid Insurance
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- vaneeza11 rated 2 months ago
- 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. 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.
- AnnoyingMoose rated 2 months ago
- Maybe we'll discover immortality before Bruce Willis dies...
- anglemona rated 2 months ago
- Cataclysmic Clockwork -Our Solar System's Deadly Orbit Through the Milky Way
