Moontanman

Well, no I didn't mention fissionable but EdEarl did and fissionable isotopes of heavy metals should be available in the Oort cloud.

No but a murdered human can be made to burn like that...

They can be moved very slowly with things like magnetic sails or ion drives, look at it like it's a very slow motorhome... There is a considerable amount of fissionable material in the rocks and metals mixed with ices in the Oort cloud but fusion technology would your best bet since both deuterium and helium 3 should be relatively easily available...

The title "expert" is a very heavy load to carry if you truely are an expert, I have areas of expertise but I shy away from claiming to be an expert...

What might be an interesting thought experiment is to take a 2000 k diameter plug out of modern day North America (before man came on and decimated the mega fauna) and take a similar plug from a continent 75 millions years ago and swap places and see how they spread and or are pushed back...

No, they could keep the inside of their colonies warm as they like, spin a torus for gravity, light up the inside, use Ort could materials to build the colony and to resupply the ecosystem inside. We could do it today with current technology, we might have to develop a few technologies in directions we haven't so far. The only thing missing is fusion technology and well have viable controlled fusion in what 20 more years?

It's also quite possible that intelligent creatures avoid gravity wells ands colonise the ort cloud/kueper belts of stars with no regard for planets inhabited otherwise. The Earth is not paradise for life and would be greedily taken over by another civilization, we have adapted to the earth not the other way around and it just might be that finding a planet close enough to earth for us to colonise would very nearly be impossible but the ort cloud objects contain everything needed to build colonies and when your spacecraft is your home the incentive to travel in close to a star is absent. Our own Ort cloud could be full of colonies of various species of intelligent creatures and we are just a statistical oddy of very little real concern for civilizations that do not need planets...

At the core of this is the question would one suppress the reproduction of the other. An adult sauropod would be all but invincible to modern mammal predators but if they simply laid their eggs and left them like most of science assumes then the baby sauropods would be easy prey but they would have had to be easy prey in the age of dinosaurs as well and yet they did survive. Given that dinosaurs had avian characteristics like a more efficient breathing apparatus coupled with large size and high activity levels i can't think of any mammal alive today I would put my money on in a confrontation with a dinosaur. Large mammals like Elephants would be vulnerable even to smaller dinosaurian predators much less something like T-rex. I think dinosaurs would suppress mammals back to smaller nocturnal spots in the food web. I can't imagine dinosaurs being able to cope with some mammals because they are so small and active and would be nearly impossible to catch, like a weasel. Depending on how cold tolerant dinosaurs were Mammals might survive in colder places while dinosaurs might do better in warmer settings.

There is another school of thought on this. Other than high power signals intentionally sent or military radar it's unlikely our "leakage" signals can be detected much more than 1/2 to 1 light year away due to interference from dust and natural radio noise. Interestingly enough signals similar to military radar have been detected but due to the intermittent nature of such signals they are unlikely to be be detected on a regular basis.

There is also the problem of them being human like skulls, why would aliens look anything like us? For evolution to have produced beings that look that much like us seems unlikely to an extraordinary degree. I see no reason why aliens would even be vertebrates much less humanoid...

Just malwarebytes, I don't know why that bit of spam came from.

That worked, thankyou!

Not on my screen for some reason I do not have that option. I tried it and it worked, odd that i can't just directly access my blog. I got a malicious web site warning when I clicked your link and this: http://www.invisionpower.com/apps/board/

I have to say 14 pages over this topic is amazingly boring and obvious, no way to tell if it is or if it isn't, being a progressive if i had to bet you can guess what my bet would be...

Any mention of radiation often brings on panic and hyperbole, the data while not reassuring is a rough comparison...

I live on the coast and while my observations are strictly anecdotal if it had a significant effect the local commercial fishermen would be reporting it for sure...

How do i go to my blog? When i click on blogs it just gives me one page of the latest blogs.

Highly enlightening, thank you.

I would have to say that there is a lot of hype around the Fukushima accident, very difficult to separate hype from reality sadly...

Do we know how much radiation was released at Fukushima compared to an atomic explosion?

Not really true, O2 levels have fluctuated from as high as 33% during the time of giant arthropods, and the great dying was in some part attributed to much lower levels than we have today. SwansonT is correct but you might have problems with providing evidence for any assertions it is killing phytoplankton.

How do I access my blog posts?

I have never been able to understand why -1 x -1 = 1 it looks wrong in a very basic way to me...

This is just speculation but i found out that megalodon was in direct competition with a monster whale, megalodon was not the baddest boy on the block, a whales intelligence and extra senses could have made the difference . Modern Orcas kill and eat great whites with relative ease could competion with dwindling resources with Livyatan melvillei have led to the extinction of megalodon? http://en.wikipedia.org/wiki/Livyatan_melvillei