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Lucas Oliver Miles away 07 Dec 17 7.22pm | |
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The grains of sand theory is just about understandable. To really do your head in Google 52 factorial which states that every shuffled deck of cards is unique ( yes I did see it on QI). If u can get your head around the calculation below then fair play to you One Of A Kind
To give you an idea of how many that is, here is how long it would take to go through every possible permutation of cards. If every star in our galaxy had a trillion planets, each with a trillion people living on them, and each of these people has a trillion packs of cards and somehow they manage to make unique shuffles 1,000 times per second, and they'd been doing that since the Big Bang, they'd only just now be starting to repeat shuffles.
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cryrst The garden of England 07 Dec 17 8.24pm | |
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Originally posted by Lucas Oliver
The grains of sand theory is just about understandable. To really do your head in Google 52 factorial which states that every shuffled deck of cards is unique ( yes I did see it on QI). If u can get your head around the calculation below then fair play to you One Of A Kind
To give you an idea of how many that is, here is how long it would take to go through every possible permutation of cards. If every star in our galaxy had a trillion planets, each with a trillion people living on them, and each of these people has a trillion packs of cards and somehow they manage to make unique shuffles 1,000 times per second, and they'd been doing that since the Big Bang, they'd only just now be starting to repeat shuffles. RIGHT
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cryrst The garden of England 07 Dec 17 8.29pm | |
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Originally posted by serial thriller
Of the ones we can see in the sky at night, almost all of them would still be there. Stars like our sun live for billions of years, and even those in other galaxies which we can observe will only be a few million light years away (how long it takes their light to reach us). Were any star in our vicinity to explode in to a supernova, we would definitely know about it. It could even sweep Earth out of the Sun's orbit, leaving us all falling through empty space!
I do remember light travels at
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stuckinbristol In the woodwork. 07 Dec 17 8.32pm | |
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Just thinking about this is making my head hurt. The opening sequence of Men in black (1,2 or 3?) where we are inside a marble being played with by aliens might just be the case.
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cryrst The garden of England 07 Dec 17 8.58pm | |
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Originally posted by stuckinbristol
Just thinking about this is making my head hurt. The opening sequence of Men in black (1,2 or 3?) where we are inside a marble being played with by aliens might just be the case. That could be how small this silly planet we live on is.
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pefwin Where you have to have an English ... 07 Dec 17 9.42pm | |
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A month ago GI said that it was more sand than stars!!!! but they are all bigitude estimates.
"Everything is air-droppable at least once." "When the going gets tough, the tough call for close air support." |
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chateauferret 07 Dec 17 9.49pm | |
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Originally posted by Ginger Pubic Wig
do we know what % of the stars we look at are still there right now (given the time it takes for their light to reach earth?) I did understand from somewhere that the Universe has produced 95% of the stars it will ever produce. Now stars that last longer than about 10 billion years are quite s***e, but red dwarves do go on for a very long time. The universe is now about 14 billion years (1.4 x 10^10) years old and after the same amoint of time again there won't be any main sequence stars any more. Eventually it will be just black holes and cold burned-out dwarves as temperature evens out and free energy runs out. The one absolutely constant and inviolate law of physics: the Second Law of Thermodynamics. Edited by chateauferret (07 Dec 2017 9.51pm)
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chateauferret 07 Dec 17 9.56pm | |
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Originally posted by serial thriller
Of the ones we can see in the sky at night, almost all of them would still be there. Stars like our sun live for billions of years, and even those in other galaxies which we can observe will only be a few million light years away (how long it takes their light to reach us). Were any star in our vicinity to explode in to a supernova, we would definitely know about it. It could even sweep Earth out of the Sun's orbit, leaving us all falling through empty space!
It would not do that, but it certainly give us a good dose of X-rays and cosmic rays, remove the upper atmosphere and ionise whatever's left. It is possible that an event such as this caused the extinctions that occurred at the end of the Permian, 245 million years ago.
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chateauferret 07 Dec 17 10.01pm | |
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Originally posted by mr. apollo
Kornreich used a very rough estimate of 10 trillion galaxies in the universe. Multiplying that by the Milky Way's estimated 100 billion stars results in a large number indeed: 1,000,000,000,000,000,000,000,000 stars They said, if you assume a grain of sand has an average size and you calculate how many grains are in a teaspoon and then multiply by all the beaches and deserts in the world, the Earth has roughly (and we're speaking very roughly here) 7.5 x 1018 grains of sand, or seven quintillion, five hundred quadrillion grains. To put matters into perspective: You can easily work out how many atoms there are in a quantity of some compound if you know its chemical formula (i.e. the ratios of the quantities of different elements) and its weight, because an atom's weight is obviously constant for all atoms of its element. A "mole" is a number of atoms not dissimilar to the one we gave for the number of stars - it's 6 x 10^23. It turns out that this number of carbon atoms weighs 14g or about half an ounce.
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Ouzo Dan 07 Dec 17 10.02pm | |
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Most shooting stars you see in the sky are ice/dirt no larger than a grain of sand. I think there have been a couple of instances (definitely one) of a humans witnessing a supernova and it being recorded. Betelgeuse remains our best hope at seeing a supernova up close & if it does go bang it wont disrupt the earths orbit, we will however have two suns in the sky for about 3 to 4 weeks Another interesting snippet, all the gold in the universe is forged in dying stars before being expelled out in a supernova, think about that the next time you put that piece of Jewellery on.
Sex Panther 60% of the time it works every time |
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Ginger Pubic Wig Wickham de L'Ouest 07 Dec 17 10.16pm | |
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Originally posted by chateauferret
It would not do that, but it certainly give us a good dose of X-rays and cosmic rays, remove the upper atmosphere and ionise whatever's left. It is possible that an event such as this caused the extinctions that occurred at the end of the Permian, 245 million years ago. well that's something I suppose
If you want to live in a world full of kindness, respect and love, try to show these qualities. |
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chateauferret 07 Dec 17 10.54pm | |
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Originally posted by Ouzo Dan
Most shooting stars you see in the sky are ice/dirt no larger than a grain of sand. I think there have been a couple of instances (definitely one) of a humans witnessing a supernova and it being recorded. Betelgeuse remains our best hope at seeing a supernova up close & if it does go bang it wont disrupt the earths orbit, we will however have two suns in the sky for about 3 to 4 weeks Another interesting snippet, all the gold in the universe is forged in dying stars before being expelled out in a supernova, think about that the next time you put that piece of Jewellery on. This is actually true for all elements heavier than nitrogen, and in fact all elements heavier than iron can only be produced in the explosion itself. Main sequence stars produce energy by fusing hydrogen into helium and by doing so the radiative pressure they create keeps the outer layers of the star "up" and stop it from collapsing under its own mass. When a star runs out of hydrogen it fuses the helium into carbon. When the helium runs out it fuses carbon into neon. Trouble is the heavier the fuel is the more s*** it is at producing energy because being heavier it requires more energy to shove the atoms together and fuse them. When the neon is all fused into oxygen it uses oxygen and makes silicon. Then it fuses silicon into iron. Iron is the lightest element which requires more energy to fuse than can be obtained from the fusion so once it starts fusing iron it can't keep the outer layers from collapsing any more. They fall in and the shockwave blows the outer layers away, distributing the heavier elements in the outer layers of the star across space. The explosion also rams atoms together at high energies and allows loose neutrons to be captured and that makes the elements heavier than iron, including gold, lead, silver, and up to uranium. Eventually those atoms become part of interstellar clouds which condense to form new star systems, and some of them will turn up on its planets. Being heavy, much of the material will fall to the centre of a new planet (the Earth's core is substantially iron). As well as providing us with many raw materials that are only manufactured in supernovae and their progenitors therefore supernovae also provide us with an iron core which is responsible for generating the Earth's magnetic field and without which radiation would reach the surface of the Earth and make it uninhabitable for complex forms of life. Without supernovae therefore there would be no football.
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