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#21
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On Sunday, January 19, 2020 at 10:55:31 AM UTC-8, wrote:
I am quite sure I understand "scientific method" far better than you. Over the years, I've created a treasure trove of useful and interesting apps. Certainly like me there are many who don't believe in BHs and consider them essentially theoretical. To each his own ... In other words, you have zero evidence to support your claim. This comes as no surprise at all. And no, it is clear that you don't understand the scientific method at all.... it is all about the evidence... sci·en·tif·ic meth·od noun a method of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses. "criticism is the backbone of the scientific method" |
#22
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I=20see=20no=20use=20in=20discussing=20this=20furt her=20with=20som=
eone=20like=20you,=20who=20is=20obviously=20out=20 of=20touch=20wit= h=20reality.=20If=20you=20want=20the=20last=20word ,=20you're=20wel= come=20to=20it,=20but=20you=20should=20really=20tr y=20to=20make=20= sense=20for=20a=20change. |
#23
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On Sunday, January 19, 2020 at 4:20:39 PM UTC-8, wrote:
I see no use in discussing this further with someone like you, who is obviously out of touch with reality. If you want the last word, you're welcome to it, but you should really try to make sense for a change. I'm out of touch with reality? I provide links that show that black holes almost certainly exist. I can provide literally hundreds of links that make the same claim, including many observations and experiments. You, on the other hand, claim that black holes do not exist, but rather are just "theoretical", without a lick of evidence to support your position. I'm afraid that it is *you* who is out of touch with reality. You obviously have a closed mind and just cannot stand the thought of being challenged when making claims that you cannot support. I suggest that you either provide evidence to support your claims or quit making them altogether. Have a great evening... |
#24
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![]() On 2020-01-05, casagiannoni optonline.net wrote: Not surprizing, even considering that intelligent apace faring species must abound throughout the universe, considering the vast interstellar distances. Even at near light speed, which is extreemly unlikely, travel times would be prohibitively long. Would they really be 'prohibitively' long, however? We know that propulsion systems capable of reaching the nearest stars within a human lifetime are possible (e.g., nuclear pulse as in Project Orion, or laser sails). Given the age of the universe there may be civilizations who have existed for billions of years: even travelling at a fraction of the speed of light that's more than enough for a civilization to cross the Milky Way several times, albeit at a slow pace and over many generations. Nothing in physics or engineering prevents it, more so for a spacefaring civilizations which, you'd assume, can command enough energy to do this at little relative expense (without any breakthrough in physics). Time and propulsion systems are no obstacle, unless you believe that a closed-cycle life support system capable of working for centuries is impossible (not just from the perspective of present human technology but for everyone in all circumstances), or that no living being can adapt to prolonged life in space (even within envisioned settlements such as O'Neil cylinders) and thus cannot be away from a planetary surface for more than a few years. Setting aside the 'UFO' question, towards which I'm a skeptic, I think it's easier to explain the Fermi paradox in terms of not having observed long enough. We have not been around (or been paying attention) long enough to claim that no intelligent species capable of interstellar travel /ever/ existed. |
#25
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casagiannoni wrote in message ...
Not surprizing, even considering that intelligent apace faring species must abound throughout the universe, considering the vast interstellar distances. Even at near light speed, which is extreemly unlikely, travel times would be prohibitively long. Perhaps this is very fortunate since a more advanced species might expoit manking as a resource, just like we do here. Confirmed by who? You obviously haven't done much research on this subject. The corrupt mainstream media and governminds are never going to confirm anything on this subject. -- http://members.optusnet.com.au/ajwerner/ The golden rule with food - if it smells strange from the fridge then throw it in the bin. With Christianity, if it sounds strange and it's from the Bible then you must embrace it as the word of God. A question to all Christians: Was the Bible inspired or dictated? Because if it was just inspired then it can't be called God's word. http://www.rumormillnews.com -- The best alternative news site. |
#26
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![]() =20 =20=20Nothing=20in=20physics=20or=20engineering= 20prevents=20it,= =20more=20so=20for=20a=20spacefaring =20=20civilizations=20which,=20you'd=20assume,=2 0can=20command= =20enough=20energy=20to=20do=20this =20=20at=20little=20relative=20expense=20(withou t=20any=20breakt= hrough=20in=20physics). As=20i've=20stated,=20even=20at=20near=20light=20s peed,=20which=20= is=20extreemly=20unlikely,=20travel=20times=20woul d=20be prohibitively=20long. Do=20the=20simple=20math.=20=20Distance=20=3d=20Sp eed=20x=20Time= =20=20! |
#27
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On 2020-06-11, casagiannoni optonline.net wrote:
Nothing in physics or engineering prevents it, more so for a spacefaring civilizations which, you'd assume, can command enough energy to do this at little relative expense (without any breakthrough in physics). As i've stated, even at near light speed, which is extreemly unlikely, travel times would be prohibitively long. Do the simple math. Distance = Speed x Time ! It might be prohibitively long for an individual, but it doesn't have to be for a /species/. With a laser sail design that's reasonable from the point of view of a 'spacefaring' civilization (with settlements in its own star system, an industrial presence, etc.) you could perhaps reach Alpha Centauri within thirty years, and your civilization could slowly hop from one nearby star to the next. At ~0.15c crossing the Galaxy would take a bit more than one million years. Even if you assume that these hops only happen once every century, that's 100 million years. This might seem 'prohibitively long' to you, but there are stars that have existed for /billions/ of years, and it's possible that technological civilizations could be just as long-lived (jellyfish have existed on Earth for half a billion years - I'm confident that an intelligent species might do the same, especially if space colonization enables it to overcome the limitations of its environment). As a last point, you allowed for "near light speed". While that's physically possible I'm less confident it would feasible from an engineering point of view, even for an advanced spacefaring species. But since you brought it up, I'll mention this. The 'opposite side' of the galaxy, 200k light years away, would take at least 200k years to reach in a single trip (the simple math that you love). That, of course, is well beyond the endurance of any known living being (and presumably of any automated ship you could build). However you forgot about relativistic time dilation: even if we assume that the craft has to slowly accelerate at 1 g until it reaches its peak speed, and then has to decelerate until its destination, from the frame of reference of its crew the whole trip would take less than 25 years. Even if there's no going back and it's an absurd proposition (since a slow expansion makes a lot more sense than cutting all ties with your home planet and choosing to settle a star on the other side of the galaxy), it shows that travel time is no obstacle. |
#28
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On 12.06.20 14:37, Porcospino wrote:
On 2020-06-11, casagiannoni optonline.net wrote: Nothing in physics or engineering prevents it, more so for a spacefaring civilizations which, you'd assume, can command enough energy to do this at little relative expense (without any breakthrough in physics). As i've stated, even at near light speed, which is extreemly unlikely, travel times would be prohibitively long. Do the simple math. Distance = Speed x Time ! It might be prohibitively long for an individual, but it doesn't have to be for a /species/. With a laser sail design that's reasonable from the point of view of a 'spacefaring' civilization (with settlements in its own star system, an industrial presence, etc.) you could perhaps reach Alpha Centauri within thirty years, and your civilization could slowly hop from one nearby star to the next. At ~0.15c crossing the Galaxy would take a bit more than one million years. Even if you assume that these hops only happen once every century, that's 100 million years. This might seem 'prohibitively long' to you, but there are stars that have existed for /billions/ of years, and it's possible that technological civilizations could be just as long-lived (jellyfish have existed on Earth for half a billion years - I'm confident that an intelligent species might do the same, especially if space colonization enables it to overcome the limitations of its environment). As a last point, you allowed for "near light speed". While that's physically possible I'm less confident it would feasible from an engineering point of view, even for an advanced spacefaring species. But since you brought it up, I'll mention this. The 'opposite side' of the galaxy, 200k light years away, would take at least 200k years to reach in a single trip (the simple math that you love). That, of course, is well beyond the endurance of any known living being (and presumably of any automated ship you could build). However you forgot about relativistic time dilation: even if we assume that the craft has to slowly accelerate at 1 g until it reaches its peak speed, and then has to decelerate until its destination, from the frame of reference of its crew the whole trip would take less than 25 years. Even if there's no going back and it's an absurd proposition (since a slow expansion makes a lot more sense than cutting all ties with your home planet and choosing to settle a star on the other side of the galaxy), it shows that travel time is no obstacle. At any reasonable speed, you will be barbecued slowly by alfa, beta and gamma radiation. I dont think living beings can survive. One SF book I read, used self-replicating space probes. When they passed a star system, they started mining, and produced replica-probes, sending those in all directions. That grows exponentially, and after a few millennia, their corner of the galaxy was covered with probes. If they detected life, send back probes loaded with that info. For a longe-lived species, that works, and you dont have to leave home. |
#29
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On 2020-06-12, Sjouke Burry wrote:
At any reasonable speed, you will be barbecued slowly by alfa, beta and gamma radiation. I dont think living beings can survive. Maybe. We actually don't know a whole lot about long-term, low-level exposure to radiation, how the body responds it and whether there are possible solutions: there is some research about drugs that could mitigate the effects of radiation; galactic cosmic rays (which are for the most part protons and alpha particles) could be shielded against with hydrogen-rich materials like plastics or by surrounding habitats with regolith mined from asteroids; etc. So we don't really know if it's a massive problem in the first place and, in case it is, whether mitigation is impossible. But of course it will be one of the challenges of interstellar travel. One SF book I read, used self-replicating space probes. When they passed a star system, they started mining, and produced replica-probes, sending those in all directions. That grows exponentially, and after a few millennia, their corner of the galaxy was covered with probes. If they detected life, send back probes loaded with that info. For a longe-lived species, that works, and you dont have to leave home. Agree that that's a possible solution (although there could be benefits to colonization 'in person'). Even if radiation isn't a showstopper imagining a a life support system that can operate without any external input for decades might be really challenging. |
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