Asteroid hazard revised: Nature.com

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    Asteroid Hazard
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Discussion Overview

The discussion revolves around the potential hazards posed by asteroids and the implications of magnetic field reversals. It includes considerations of how these phenomena might affect Earth and humanity, touching on both theoretical and speculative aspects.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants note that large meteorites are more likely to disintegrate in the atmosphere before reaching Earth than previously believed.
  • One participant expresses concern about the potential for magnetic pole reversals, suggesting that this could have significant implications for navigation and technology.
  • Another participant questions the historical frequency of magnetic pole reversals and their effects, pondering whether compasses would function differently post-reversal.
  • There is speculation about the timeline for a possible magnetic reversal occurring within the next 1000 years, with some participants suggesting this is a relatively short period in human history.
  • Participants discuss the potential effects of a magnetic field reversal on humanity, including the impact on navigation and electronics, with some expressing skepticism about catastrophic outcomes.
  • Questions are raised about how the Earth's magnetosphere might change during a reversal and whether phenomena like the Aurora Borealis could be observed at different latitudes.

Areas of Agreement / Disagreement

Participants express a variety of views on the implications of magnetic field reversals, with no consensus reached on the potential effects or the likelihood of such events occurring in the near future. The discussion remains unresolved regarding the specific impacts on technology and navigation.

Contextual Notes

Participants reference various sources and theories regarding magnetic pole reversals and asteroid hazards, but there are limitations in the assumptions made about historical events and the effects on modern technology.

Who May Find This Useful

This discussion may be of interest to those studying planetary science, geophysics, or anyone concerned with the implications of cosmic events on Earth and human society.

Ivan Seeking
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"Large meteorites are more likely to break up in the atmosphere before they hit the Earth than was previously thought, scientists in Britain and Russia have calculated."

http://www.nature.com/nsu/030714/030714-11.html
 
Astronomy news on Phys.org
Great! Now we only need worry about the magnetic poles flipping!
 
I thought the Magnetic poles where supposed to flip every couple of milleniums anyway? Does anybody know what actually happened last time the Poles switched?

Does this mean that Compasses will be backwards after that? If so just think of how much money a compass maker could get just by swapping it around.
 
I was under the impression of having read something very recently in New Scientist, suggesting we're on a possible crux - the possibility of a reversal occurring over the next 1000 years. That's not a great span in terms of human history.
 
What exactly would be the effects of a magnetic field reversal on humanity? I doubt that the effects would be clastrophobic because it has happened many times before; and mass extinctions don't seem to really have a link with magnetic field reversals. Of course, compasses will start to fail to work effectively, but we're finding better ways to find the direction of North; and the change is also gradual, so animals which rely on magnetism to navigate will have time to adapt..

How would the magnetosphere of the Earth change, for instance? Would we see the Auora Borealis at the Equator with a change, but not necessarily a reversal, in the magnetic fields? :P
 
What would be the effect of a magnetic field reversal?

Lost your satellites, for starters.

A field reversal will have a major impact on those societies most dependent upon electronics.

At least, that's the impression I'm under.
 

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