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    Thread: Redefining habitable zone for advanced Terran animals
Post: RE: Redefining habitable zone for advanced Terran ...

After some double checking on my part, it looks as though you are right. While the core of Mars is far colder than that of the Earths, it is still hot enough to remain molten. I was a bit too hasty wi...
Avalancheon Real Life But OA Relevant 11 9,137 06-19-2019, 07:12 PM
    Thread: Redefining habitable zone for advanced Terran animals
Post: RE: Redefining habitable zone for advanced Terran ...

(06-18-2019, 12:38 AM)iancampbell Wrote: Possibly. But there are IMHO two problems with this. One is that the resulting biosphere might generate minor amounts of gases that would be dangerous to Ear...
Avalancheon Real Life But OA Relevant 11 9,137 06-18-2019, 06:38 PM
    Thread: Redefining habitable zone for advanced Terran animals
Post: RE: Redefining habitable zone for advanced Terran ...

(06-11-2019, 10:51 PM)Drashner1 Wrote: On another note - would the increase in UV also result in an increase in ozone in the upper atmosphere that might mitigate the production of CO? Just some tho...
Avalancheon Real Life But OA Relevant 11 9,137 06-12-2019, 09:34 PM
    Thread: Redefining habitable zone for advanced Terran animals
Post: RE: Redefining habitable zone for advanced Terran ...

There have been many studys attempting to estimate the habitable zone for an Earthlike planet. The validity of the broader estimates (such as those proposed in the 1993 Kasting study) is dependent on ...
Avalancheon Real Life But OA Relevant 11 9,137 06-12-2019, 09:25 PM
    Thread: Live long and prosper
Post: RE: Live long and prosper

(05-19-2019, 11:57 AM)Noclevername Wrote: Anyone have an idea where I can find good, up to date sources, not filtered through the distorting lens of pop-sci and headlines? There is a website that co...
Avalancheon Real Life But OA Relevant 4 4,187 06-03-2019, 06:21 PM
    Thread: Tough SF Blog
Post: RE: Tough SF Blog

(10-15-2018, 09:11 PM)stevebowers Wrote: From there; Stealth in Space: http://toughsf.blogspot.com/2016/03/stea...sible.html Space Warship design: http://toughsf.blogspot.com/2016/07/spac...ocess....
Avalancheon Worldbuilders Resources 3 4,724 10-23-2018, 01:05 AM
    Thread: AI Gods and other universes
Post: RE: AI Gods and other universes

(09-07-2018, 07:41 AM)dsmike1980 Wrote: I apologize if I put this thread in the wrong forum. Is it possible for an S6 to gain access to a pre-existing parallel universe, as in one that it did not ...
Avalancheon General Setting Discussion 9 145 09-10-2018, 08:15 PM
    Thread: Too many small alien civs in Milky Way?
Post: RE: Too many small alien civs in Milky Way?

To continue with my banter, I don't think there are any HEECs in our Galaxy. Such civilisations would be easy to observe, and yet we see none. Then there is the sheer improbability of it... Essentiall...
Avalancheon General Setting Discussion 35 506 08-26-2018, 08:03 PM
    Thread: Too many small alien civs in Milky Way?
Post: RE: Too many small alien civs in Milky Way?

(08-05-2018, 05:02 AM)Matterplay1 Wrote: Another way to approach these numbers is to consider the internal consistency of the OA setting, and look at the history. From the example of the Terragens, ...
Avalancheon General Setting Discussion 35 506 08-26-2018, 07:36 PM
    Thread: Could a gamma ray burst destroy life on Earth?
Post: RE: Could a gamma ray burst destroy life on Earth?

(08-24-2018, 07:32 AM)tmazanec1 Wrote: Do you mean you think such high power GRBs are more likely, or less likely? In my opinion, the probability of the 1000 KJ scenario (high energy) is being under...
Avalancheon Real Life But OA Relevant 9 8,611 08-26-2018, 03:05 PM
    Thread: Evolution of the human brain: when bigger is better
Post: RE: Evolution of the human brain: when bigger is b...

In the last few years, there have been major steps in understanding how our species gained such remarkable mental powers. One such work was The Human Advantage: How Our Brains Became Remarkable. The ...
Avalancheon Real Life But OA Relevant 32 24,512 08-21-2018, 02:58 PM
    Thread: Could a gamma ray burst destroy life on Earth?
Post: RE: Could a gamma ray burst destroy life on Earth?

Finally got an update. After reading this paper, things are more clear to me.  The energy fluence of 100 kilojoules per square meter was chosen based on a probability estimate within a 500 million ye...
Avalancheon Real Life But OA Relevant 9 8,611 08-21-2018, 02:44 PM
    Thread: Could a gamma ray burst destroy life on Earth?
Post: RE: Could a gamma ray burst destroy life on Earth?

(08-05-2018, 08:47 PM)Rynn Wrote: Looking through the paper it is annoying that the authors don't explain that assumption, there are plenty of citations however so have you checked those? Your math...
Avalancheon Real Life But OA Relevant 9 8,611 08-07-2018, 09:58 AM
    Thread: Could a gamma ray burst destroy life on Earth?
Post: RE: Could a gamma ray burst destroy life on Earth?

(08-05-2018, 07:36 PM)stevebowers Wrote: Anders Sandberg looked at this question a few years ago. http://aleph.se/andart2/tag/gamma-ray-burst/ His rather basic analysis of the problem indicates tha...
Avalancheon Real Life But OA Relevant 9 8,611 08-07-2018, 09:50 AM
    Thread: Could a gamma ray burst destroy life on Earth?
Post: RE: Could a gamma ray burst destroy life on Earth?

(08-05-2018, 02:31 PM)Drashner1 Wrote: Hm. Various initial thoughts here. 1) Per the Wikipedia page on GRBs, no observed GRB event has taken place within our galaxy. The nearest GRB so far observed...
Avalancheon Real Life But OA Relevant 9 8,611 08-05-2018, 03:24 PM
    Thread: Could a gamma ray burst destroy life on Earth?
Post: Could a gamma ray burst destroy life on Earth?

Recently, I have been wondering whether or not the cosmic phenomenon known as gamma ray burst (GRB) could explain the absence of alien civilisations in the Universe. My suspicion was heightened after ...
Avalancheon Real Life But OA Relevant 9 8,611 08-05-2018, 01:28 PM
    Thread: Could an S1 conquer Earth?
Post: RE: Could an S1 conquer Earth?

(07-04-2018, 09:16 AM)Crossroads Wrote: I understand that when the first S1 arose, it was in the Interplanetary Age, and they laid low and were quite secretive for a while, and didn't bother the res...
Avalancheon General Setting Discussion 16 247 07-05-2018, 08:33 AM
    Thread: How difficult is the transition to multi-cellular life?
Post: RE: How difficult is the transition to multi-cellu...

(06-28-2018, 04:29 AM)stevebowers Wrote: I'm thinking that we could have around 300-500 Earth-like Garden Worlds (even these would only be approximately Earth-like, and most would not support unmodi...
Avalancheon Real Life But OA Relevant 26 24,457 06-28-2018, 03:16 PM
    Thread: Miniaturised particle accelerators?
Post: RE: Miniaturised particle accelerators?

WRT the revised draft article, I'll leave that part to Roger. His understanding of the subject is way beyond me. Fortunately, I think we are all in agreement that magmatter isn't quite as hard to cr...
Avalancheon General Setting Discussion 25 388 06-28-2018, 02:43 PM
    Thread: Miniaturised particle accelerators?
Post: RE: Miniaturised particle accelerators?

So guys, have any edits been made to the magmatter article?
Avalancheon General Setting Discussion 25 388 06-27-2018, 03:56 AM