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    UFOs & Extraterrestrial Life

    nomadski
    nomadski


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    Post  nomadski Wed Aug 03, 2022 7:26 pm

    https://www.space.com


    It will take a Rogue planet travelling at 13000 km/sec , about 6000 years on average to travel to nearest , six , Earth- like planets . Or about 36000 years to explore the nearest six Earth- like planets altogether . For an advanced self - sustaining civilization living inside this travelling planet , it is perfectly possible to colonize such planets .


    https://m.youtube.com/watch?v=nh8XRpTuKIs


    I think James Webb , should look at these planets first !


    https://differentimpulse.com/james-webb-space-telescope-could-begin-learning-about-trappist-1-atmospheres-in-a-year/


    GarryB
    GarryB


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    Post  GarryB Thu Aug 04, 2022 12:14 am


    It will take a Rogue planet travelling at 13000 km/sec , about 6000 years on average to travel to nearest , six , Earth- like planets . Or about 36000 years to explore the nearest six Earth- like planets altogether . For an advanced self - sustaining civilization living inside this travelling planet , it is perfectly possible to colonize such planets .

    But the mass of a planet means you go in the direction you are travelling in so those six earth like planets need to be in the direction the rogue planet is already heading in and in a line and once you have past those planets they are gone... no going back.

    The energy needed to steer and fly this rogue planet would be enormous.

    I seem to remember reading a book on ways to potentially destroy the planet and it mentions the energy required to move the earth off its orbit and either directly into the sun or out off into deep space was approximately the same as the energy needed to completely destroy the planet.... and was enormous.

    The only way I could think of would be if you could develop gravity wave energy, so you could have gravity stations all around the planet which are directed at local masses which either push or pull depending on where you wanted to go... a bit like Spiderman and his webs flying through a city of high rise buildings using his spider webs to pull him around... except on a much larger scale.

    Theoretically gravity waves have no range limit... technically the gravity of galaxies thousands of light years away are exerting a tiny pull on you right now, but the effect is so tiny you can't measure it, which means if you could create a gravity manipulator you could push or pull your way through space... if you think of the traditional way of viewing gravity as the mass being a ball on a springy surface like a trampoline... the greater the mass the deeper the depression and so other mass approaching that mass fall towards it when they get close enough to the distorted or curved space near by.

    In that sense a gravity device might curve space ahead of the mass to make it fall that way too... but how much energy it would require to move an entire planet is hard to say...

    Even if it would work in the first place.

    Note most Sci fi stuff have inertial dampeners so that when their ships accelerate away at the speed of light the crew is not squashed flat like jam on the rear walls of their ship. The only other way around it would be to put everyone suspended in a liquid, but even then they could not accelerate the way they are shown to, but then they would also float around their ships when travelling anywhere.

    In Star Trek they often travel at a specific speed like warp factor 3 or something, yet they depict the journey as needing constant engine operation to maintain that speed when in fact once they have achieved the speed they could turn the engines off and would only need to use the engines to change direction, or speed up or slow down.

    Their sublight engines would be the same.

    nomadski likes this post

    kvs
    kvs


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    Post  kvs Thu Aug 04, 2022 1:09 am

    The vast majority of rogue planets are Jupiter class objects that formed in the inner orbits, aka hot Jupiters. They can get ejected
    easily from binary star systems thanks to the 3 body problem. There are supposed observations of "stable" three body systems where
    a large planet or small third star is doing some strange orbit around the primary binary stars, but these are certainly quasi-stable
    regimes and not some guaranteed configuration.

    It is unlikely that small, Earth like planets become rogue planets without some event like a heavy object passing through their star
    system (e.g. neutron star or maybe a "black hole"). The collection of rocky small planets that are not gas giants that we have
    in our system is the result of having a small and stable single star. In binary star systems the chaotic orbit regime will ensure that
    any smaller planets get consumed by larger bodies during planetary formation. Even in our system we have a mopping up occurring
    since the beginning that has removed most of the small objects and also constrained the planets into a plane.

    Really, the cheesy Space 1999 scenario is more plausible where some intelligent life generated propulsion event drives a small moon
    out of a system. But this "spaceship" will not be on a steered trajectory and will not visit interesting places like in the TV show.

    GarryB and nomadski like this post

    nomadski
    nomadski


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    Post  nomadski Thu Aug 04, 2022 9:28 am

    We hijack Deimos moon and put fusion propulsion on it and point it at proxima star system . Carry 1500 couples , genetic viable population , who live in interior using advanced agriculture , safe from cosmic radiation and meteor impacts and space debris . Can be done very soon . How much thrust can fusion Rocket produce to push this mass to say 13000 km/ sec ?

    https://theplanets.org/moons/


    https://biology.stackexchange.com/questions/5524/how-many-people-are-required-to-maintain-genetic-diversity#:~:text=To maintain healthy genetic diversity and establish enough,species will likely go extinct by natural causes.

    https://worldbuilding.stackexchange.com/questions/9582/how-many-people-can-you-feed-per-square-kilometer-of-farmland#:~:text=So one sq. km would meet the calorie,a sq. km. of fertile modern-tech cultivated land.



    https://medium.com/predict/the-fusion-rocket-that-could-dominate-interplanetary-travel-d4a8234c67cd


    https://theplanets.org/deimos/

    kvs likes this post

    GarryB
    GarryB


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    Post  GarryB Fri Aug 05, 2022 9:14 am

    Rock can crack and is neither water nor air tight most of the time without a serous amount of sealing and other work to make it air tight.

    It would serve no advantage to use a large object like a small moon or asteroid because it will always be heavier than a space ship equivalent made of metal.

    Having massively over engineered construction materials that are heavier and bulkier than modern materials makes no sense at all except perhaps on a metal starved planet or a metal based moon or asteroid where in essence you are taking resources with you, but the object can never be big enough to be useful.

    An example would be using water as a building material... you have a fine outer structure that has some sort of heat distribution system so the side facing the sun in earth orbit does not get too hot and conversely the side facing away does not get too cold... and then fill the interior with a pressurised airspace and enormous volumes of water which in its frozen form constitutes potential hydrogen fuel and water and rocket fuel and protection from solar radiation and air resources... you could carry a billion litres of water as a resource, but again the problem is that amount of weight will reduce your speed and acceleration potential and every change in direction and speed will require more energy because of its mass.

    The Space 1999 premise was that nuclear waste stored on the moon exploded, but obviously the force needed to blow it out of earth orbit and out of solar orbit into deep space the get anywhere near any other star system to meet even just one alien race would have shattered the moon into tiny pieces instead and instead of roaming the universe they really would have become a ring system around the earth for a few million years...

    nomadski likes this post

    starman
    starman


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    Post  starman Today at 12:48 pm

    nomadski wrote:
    Also as a Sun ages , it expands and becomes hotter . Swallow it the inner planets or burning them up . While the outer planets heat - up more and become more habitable  and forcing migration to outer planets .

    After a star leaves main sequence it's probably best to just leave the system altogether.

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