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Top 20 apocalyptic scenarios of world ending.

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We've had a good run of it. In the 500,000 years Homo sapiens has roamed the land we've built cities, created complex languages, and sent robotic scouts to other planets. It's difficult to imagine it all coming to an end. Yet 99 percent of all species that ever lived have gone extinct, including every one of our hominid ancestors. In 1983, British cosmologist Brandon Carter framed the "Doomsday argument," a statistical way to judge when we might join them.

Rated 0 points - posted 8 years ago by Anthonyreid in category Science.
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Divine intervention Report Abuse
6 points - added 8 years ago by Anthonyreid -

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Gamma-ray burst Report Abuse
If you could watch the sky with gamma-ray vision, you might think you were being stalked by cosmic paparazzi. Once a day or so, you would see a bright flash appear, briefly outshine everything else, then vanish. These gamma-ray bursts, astrophysicists recently learned, originate in distant galaxies and are unfathomably powerful- as much as 10 quadrillion (a one followed by 16 zeros) times as energetic as the sun.
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Asteroid impact Report Abuse
Once a disaster scenario gets the cheesy Hollywood treatment, it's hard to take it seriously. But there is no question that a cosmic interloper will hit Earth, and we won't have to wait millions of years for it to happen. In 1908 a 200-foot-wide comet fragment slammed into the atmosphere and exploded over the Tunguska region in Siberia, Russia, with nearly 1,000 times the energy of the atomic bomb dropped on Hiroshima.
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Global war Report Abuse
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Giant solar flares Report Abuse
Solar flares- more properly known as coronal mass ejections- are enormous magnetic outbursts on the sun that bombard Earth with a torrent of high-speed subatomic particles. Earth's atmosphere and magnetic field negate the potentially lethal effects of ordinary flares. But while looking through old astronomical records, Bradley Schaefer of Yale University found evidence that some perfectly normal-looking, sunlike stars can brighten briefly by up to a factor of 20. Schaefer believes these stellar flickers are caused by superflares, millions of times more powerful than their common cousins.
3 points - added 8 years ago by Anthonyreid -

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Rogue black holes Report Abuse
Our galaxy is full of black holes, collapsed stellar corpses just a dozen miles wide. How full? Tough question. After all, they're called black holes for a reason. Their gravity is so strong they swallow everything, even the light that might betray their presence. David Bennett of Notre Dame University in Indiana managed to spot two black holes recently by the way they distorted and amplified the light of ordinary, more distant stars.
3 points - added 8 years ago by Anthonyreid -

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Collapse of the vacuum Report Abuse
In the book Cat's Cradle, Kurt Vonnegut popularized the idea of "ice-nine," a form of water that is far more stable than the ordinary kind, so it is solid at room temperature. Unleash a bit of it, and suddenly all water on Earth transforms to ice-nine and freezes solid. Ice-nine was a satirical invention, but an abrupt, disastrous phase transition is a possibility.
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Global epidemics Report Abuse
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Ecosystem collapse Report Abuse
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Flood-basalt volcanism Report Abuse
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Someone wakes up and realizes it was all a dream Report Abuse
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Alien invasion Report Abuse
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Mass insanity Report Abuse
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Nanotechnology disaster Report Abuse
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Reversal of Earth's magnetic field Report Abuse
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Particle accelerator mishap Report Abuse
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Biotech disaster Report Abuse
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Environmental toxins Report Abuse
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Global warming Report Abuse
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Robots take over Report Abuse
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