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Also, assuming there are advanced civilizations in our visible universe, none of them have produced a universe destroying event... At least not for the last 14

by maeon3 15y ago

Also, assuming there are advanced civilizations in our visible universe, none of them have produced a universe destroying event... At least not for the last 14 billion years. We are safe. everything going on at the lhc has already happened Near the earth. On the plus side, if something does go wrong, you wont get a chance to worry about it.

jordanb 15y ago
I don't think we have to go that far. These particles exist in nature, but not conveniently here on earth in the vicinity of test equipment. The Universe produces very high energy events all the time -- supernova among others -- and many of these have happened within our light cone, yet have not thrown a wave of new vacuum at us.
- sp332 15y ago
  Since the expansion happens at the speed of light, we would have no advance warning. We couldn't "see" the event approaching us, since the event would arrive at the same time as the light from it.
  - JanezStupar 15y ago
    That is if the event would have been instantaneous. Otherwise it would probably be the most beautiful phenomena possible. Also this event might have happened somewhere in the universe and never reach us. Right?
    - sp332 15y ago
      Let's say the event happens 4 light-years away from us. It's not traveling instantaneously, it's only traveling at the speed of light. So it will take 4 years to get here. But we will never see it, because the light from the event will also take 4 years to get here, so we will be destroyed at the same time that the light from the event arrives.
      - JanezStupar 15y ago
        Well if the phenomena was not instantaneous and would have some sort of "flash" preceding the shock wave, for a couple of minutes. It could be visible. And anything on that scale would be extremely bright and beautiful. Its just an alternative to black wall you will never see or feel. But honestly I have no idea which one is more likely.
finnw 15y ago
Or maybe they have, and it has yet to reach us.
- stouset 15y ago
  Then we'd better strike first.
deleted 15y ago
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civilian 15y ago
The earliest that sentient life could develop is probably ~5 billion years after the big bang. So you should only count the last 9 billion years. :D (I'm basing it off of: 1 billion years for a star to form & explode to provide the heavier elements needed for a rocky planet. Another 1 billion years for a new solar system to form, another billion years for the rocky inner planet to cool off, another 1 billion for simple life to develop, and then another billion for intelligent life to develop.)

by maeon3 15y ago

jordanb 15y ago

I don't think we have to go that far. These particles exist in nature, but not conveniently here on earth in the vicinity of test equipment. The Universe produces very high energy events all the time -- supernova among others -- and many of these have happened within our light cone, yet have not thrown a wave of new vacuum at us.

sp332 15y ago
Since the expansion happens at the speed of light, we would have no advance warning. We couldn't "see" the event approaching us, since the event would arrive at the same time as the light from it.
- JanezStupar 15y ago
  That is if the event would have been instantaneous. Otherwise it would probably be the most beautiful phenomena possible. Also this event might have happened somewhere in the universe and never reach us. Right?
  - sp332 15y ago
    Let's say the event happens 4 light-years away from us. It's not traveling instantaneously, it's only traveling at the speed of light. So it will take 4 years to get here. But we will never see it, because the light from the event will also take 4 years to get here, so we will be destroyed at the same time that the light from the event arrives.
    - JanezStupar 15y ago
      Well if the phenomena was not instantaneous and would have some sort of "flash" preceding the shock wave, for a couple of minutes. It could be visible. And anything on that scale would be extremely bright and beautiful. Its just an alternative to black wall you will never see or feel. But honestly I have no idea which one is more likely.

finnw 15y ago

Or maybe they have, and it has yet to reach us.

stouset 15y ago
Then we'd better strike first.

deleted 15y ago

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civilian 15y ago

The earliest that sentient life could develop is probably ~5 billion years after the big bang. So you should only count the last 9 billion years. :D (I'm basing it off of: 1 billion years for a star to form & explode to provide the heavier elements needed for a rocky planet. Another 1 billion years for a new solar system to form, another billion years for the rocky inner planet to cool off, another 1 billion for simple life to develop, and then another billion for intelligent life to develop.)