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    What are some of your favorite science-fiction novels?

    Hello all, Well read Sci Fi fan here so ill give some of my favourites: Larry Niven is mentioned but only his Ringworld series - A mote in Gods Eye was a good read. Peter F Hamilton has been mentioned above - big fan of the Void and Commenwealth series of books. Arthur C Clarke Love...
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    Occupying Space

    This. Just this. I love reading these posts about colonising space. Especially funny about growing our own food in space - because we have done such a good job at understanding/protecting ecosystems on earth. I love the trivialisation of economical and technical requirements. Although I...
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    Infinite Universe?

    I think what Cronos mentioned about a temporal cutoff is pretty important. Space may very well be infinite but time (at least as we understand it) is not infinite and holds little relevance once we get to Planck times and physics just breaks down. I may be wrong but I think that: Even if...
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    Warp drive and bubble

    Are you being ignorant on purpose? There are no "theoretical" videos on warp drives because that would require a theory in the first place. Any proposals for Alcubierre drives (Warp drives) possess about as much scientific theory as my own idea that only invisible pigs can fly and that why we...
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    Stephen Hawking's did god Create the Universe discovery documentary

    Maybe so but to claim a "bitter man lashing out at the unfairness of his life" has about as much validity and authority as Hawkings opinions on god. Any scientist has a right to take a public stance on God, so long as they do not determine or promote their stance to be any more important or...
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    Stephen Hawking's did god Create the Universe discovery documentary

    I suspect he would not want nor require your pity.
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    Questions about Universe expansion

    The Earth is at the center of the Observable Universe but this doesnt imbue it with any preferential frame - all points are at the center of their own observable universe - due to the expansion of the Universe and the finite speed of light. The furthest places we can "see" do appear to be...
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    Is this possible? (regarding observable and actual size of universe)

    It is difficult to understand because the toplogy is dependant on curvature, The reason we theorise this is because the OU we observer is isotropic. This isotropy must extend beyond our Observable Universe otherwise if beyone our OU was a vastly different matter or energy distribution we...
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    Is this possible? (regarding observable and actual size of universe)

    Just to add to Ich and to my previous posts: Spatially, there are no preferred frames of reference, so no place in the Universe we can point to and say "that is the center" or "that is the egde". However there is a differed sort of edge to the Universe - that is a temporal edge, what this...
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    Is this possible? (regarding observable and actual size of universe)

    Hello, If we could stand at Planet X at the edge of our Observable Universe, then standing on Planet X we would once again be at the center of our observable Universe! Remember that the reason we can "see" anything is that the light has had time to reach us. If we were on Planet X we would...
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    On A Universe From Nothing

    I understand why you are reticent to verbalise this further - subteleties in language differences will leave different desciptions to different readers. However I do find this a strong idea and it is something I have thought about before. As you know I am no great (nor even good)...
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    How do we move around the sun?

    Yes he was. General Relativity encompasses a mathematical description of space time curvature created by mass or acceleration.
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    Size of the Universe just after Big Bang

    This is a tough question with only two possible outcomes: 1. If the Universe is infinite then at t=1s the Universe is still infinite 2. If the universe is finite then at t=1s the Universe is still finite Now I suppose we could look at possible lower bounds for estimated finite size, but...
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    What will Juice tell us about Europa?

    I am very interested in the Juice missions and I sincerely hope it goes ahead as planned and within budget. If we are ever going to find any non terrestrial life then I think the Jovian moons are the place to start - who knows: it may be that beneath the ice sheets of the J-moons are complex...
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    Which would you fund?

    I think Juice has more possibility of public appreciation/interest which will help funding. Also I think we really should get as much space travel under our belts as possible! As Ryan has said as well - Jupiters moons could hold immense amount of new information and possible even life!
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    Issues regarding the expansion of the Universe at the subatomic level

    This is right. Gravitationally bound systems overcome the force of expansion on the local scale. (Local planetary systems, star systems, galaxies and clusters.) On the large scale expansion wins out but on the small scale gravity is king.
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    If Betelgeuse Went Supernova Soon

    Interesting topic Drakkith. Does anyone know the magnitude Betelgeuse going nova would be? Just wondering how visible this would be during the day and at night - I suspect it would light up the night sky and be clearly visible through the day but would be interested in the numbers.
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    Half closed universe

    We cant check it. We can make certain assumptions though, we can use the cosmological principle of homogeneity and we can make a pretty good assumption that past the OU is more of the same - whether that is applicable to infinity or just a much larger U than the OU (their are studies which...
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    How fast are we actually going?

    You can use this link for calculating recession speeds based on redgarbages. As you can see there are galaxies which we can currently observe but are now receeding >c.
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    On the infinity of the Universe

    Well if the BB is the origin of the Universe then by default it is the origin of the OU. We cannot assume the Big Bang as a "beginning" of anything, remember when we talk about the Big Bang we are talking about T>plancke time and not t=0. I think isotropy has a large role to play here...
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    How fast are we actually going?

    I did not caveat my earlier point and mention this is caused by Earths actual kinemtaic movement through space, rather than a result of expansion. I should have made that more clear and you are correct in pointing it out as an important distinction.
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    How fast are we actually going?

    We are not accelerating within our own reference frame. We are at rest with regards to the CMB, which any other observer will observe from their FoR (Every galaxy is the center of its own OU with expansion moving outwards.) Distant galaxies can be receeding from us >c. As to them we would...
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    Is the universe going to die?

    This statement can also not be qualified - proton decay is a hypothetical scenario and has never been observed due to its nature.
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    Is the universe going to die?

    It is theoretically real but for obvious reasons has not been observed in nature. You cannot qualify this statement as fact and you should not present it as such. Hawking radiation is a prediction of prevailing theory. Sound horizons are an entirely different thing.
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    Which planet in this solar system would be most appropriate to terraform?

    I would love to see your numbers on this. Does this 100-500 years take into account development of all the necessary technology required for this endeavour? I find the timescales you are talking about a little absurd. We cannot just drop plants onto a Venusian atmosphere - we would need to...
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    The Limitations of Intergalactic Travel

    A small ship will still need sufficient fuel - proportional to the mass of the ship. A small ship will still need adequate sheilding, adequate storage and adequete computational power - assuming light year distances it would need to be of sufficint sophistication to make decisions. The relevant...
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    The speed of light. What's the story, really?

    C is a very special number. C is the speed of all massless particles in a vacuum, so anything with 0 mass travels at C. Anything with mass does not and cannot travel at C. As anything with mass accelerates towards C it takes more and more energy to get closer to C, to actually reach the speed...
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    Gravity, and were it starts.

    Yes just remember gravity is not confined to planets/suns. All objects with mass have a gravitational curvature on spacetime. The Sun, Earth and Moon are our most obvious examples of spacetime curvature, while gravity is the weakest fundamental force it can also dominate such as in the Solar...
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    What happens when a neutron star collapses into a black hole?

    I agree with this, they are easy to model - but is this only applicable from an external perspective?
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    An impossible thought!

    If I were to become the supreme being of all the multiverse and then erase all of humanities memories and it wasnt on this forum then its already happened! Also this could mean.... sorry I got distracted by the blue and yellow spotted dwarf piglet flying past the window. Please dont post...