Comment Easy (Score 1) 149
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Which is why stars tend to blow up when they star fusing Iron. They can no longer sustain their mass.
I agree.
At present we dig up vast amounts of thorium as waste from regular mines, especially when digging up rare earths.
Uranium is in very short supply, and 99% of it in nature is useless for power generation, and when that 1% is used for power, we only extract about 0.5% of the power in it.
Thorium on the other hand is about 10 times more abundant then uranium, and 100% of it is usable for power, and nearly 100% of the thorium used will be converted.
True, and false.
The energy we burn now was collected from the sun, millions of years ago, over a vast amount of time.
Care to elaborate?
What is preventing solar power from exceeding 30% efficiency?
0.3% of sahara is still 28.2 billion m2
Add construction, infrastructure, maintenance and storage for about 2/3 of the energy produced, and cost becomes prohibitively expensive.
I'm not saying that we shouldn't do part of it, but it is infeasible to do it all. I'm not even sure there is enough copper left in the world to pull it off.
2% of Sahara's surface is still a MASSIVE area. And the production works best in the day time. Then there is that little problem of Sahara being a very unfriendly place for something like this. Constant wind and sand getting everywhere you don't want it, on the receptor surfaces and in the mechanics.
Sahara is about 9,400,000 km2, 2% of that is still 188,000 km2 or 188 billion m2
When ever I hear talk about renewable energy, they are always talking about peak capacity, they forget that at best a Wind Turbine only produced about 50% of its rated power on average. Too little wind, or too much, and they produce nothing.
But there is always one thing they forget, and IIRC that is the main energy consumer of them all: Cars. Or rather ALL transport that aren't done by rails. True, there are electric cars, but:
1. Limited range
2. They take a lot of time to recharge, though some are trying to get around that, the problem being that of building up the infrastructure before the systems can be put to use. This is nearly prohibitively expensive.
3. Batteries.
Flamebait
You are thinking of Star Trek fans, this is Star Wars.
And if the fire had started 20 minutes earlier?
I'd say it looks like luck that people had disembarked prior to the fire.
"So, how many cubic meters in a liter (in your head, please, and quickly)? How many grams of water in a cubic meter of water? And why aren't either of these 1? Using arbitrary orders-of-magnitude for more-or-less fundamental measures sure doesn't make the system simpler..."
In my head, 1 m^3 = 1000l, so 1l is 0.001m^3
1 m^3 of water is 1000kg = 1,000,000g
Materials have different densities. Water happens to be an easy one to get, and it is incompressible (great for volume calculations).
So SI volume and weight is based on (pure) water, at 20 degrees centigrade. 0 degrees C is the freezing point of water at 1000hPa), and 100 degrees C is the boiling point.
Why they didn't normalize standard atmospheric pressure to 1000hPa I have no idea. it is about 1013hPa if I recall.
Oh dear.
1m^3 = 1000 liter = 1 metric ton (when the material is water at 20C)
And to add the confusion some non metric people (and some metric ones) make when writing is that in volume or area, you really can not use k for 1000 m^3.
1 km^3 = 1 billion m^3
And didn't they just go negative on the Kelvin scale?
One way to make your old car run better is to look up the price of a new model.