• June 15, 2021, 4:41 p.m.

    I've discovered only recently this series, and I'm watching it from the start bit by bit.
    But when I arrived to the Matrioshka world episode, there was a point that sound strange to me: IA start talking about how to increase the radiating surface of the Matrioshka world to help with heat management, but even if my physics is a bit rusty, it seems to me that in vacuum, where there is no convection, only radiation is useful, and for this reason only the part of an hypothetical fin that's invisible to any other fin would be useful, otherwise they would simply be radiating heat into each other.
    So, creating complex fractal figures to radiate heat would not be really useful, as the best way should be simply having the largest flat surface perpendicular to the radiating light of the sun... or am i missing something?

  • July 10, 2021, 7:41 a.m.

    What's the name of the idea or hypothesis that says that the new aliens we will encounter will have a physical appearance closer to us, with two eyes, with limbs... etc
    since we are probably in the mean average of how things look like.

    Meaning the first alien we encounter will probably have a fair resemblance to us —maybe it looks like an insect— but it wont be a gaslike being with no internal organs since that would drift so much apart from us.

  • July 11, 2021, 6:08 a.m.

    You could be talking about a couple of different things. First there is the Principle of Mediocrity. Below is Wikipedia's definition:

    You could be talking about Convergent Evolution. Again Wikipedia:

    I think the general consensus is that if we ever run into intelligent aliens they won't remotely resemble us. While I don't believe they will look like star trek aliens(just like us but with prosthetic foreheads on their real foreheads), I am sure we will share a lot of same form and features. Bilateral symmetry, two forward facing eyes, opposable digits, etc.

  • July 12, 2021, 11:18 a.m.

    Thank you

  • July 14, 2021, 5:56 a.m.

    Below is an example of convergent evolution. It depicts a Thylacine and Wolf. Two completely different species. The last common ancestor between these two species was a shrew like animal about the size of your thumb that lived 160 million years ago. If you came across one their skulls, you'd need to be an expert to know which one was which. The two species evolved isolated from each other on different continents; the Thylacine is from Australia and the Gray Wolf is from where ever gray wolves came from.

    What can we conclude this example? Life favors certain shapes for certain niches. If we ever find the skull of an intelligent alien species, it might be eerily similar to a human skull....so much so that who ever finds might mistake it for a human skull.

    Convergent evolution

  • Sept. 23, 2021, 11:04 p.m.

    Since I started watching Science & Futurism on nebula, there were a lot of times when further questions popped into my head. So I thought I'd try posing one here. So here goes the first post:

    So habitats beeing also spaceships and some could have an outer athmosphere e.g. hydrogen as shielding - what happens when parts of this gas get ionized ( e.g. cosmic or other radiation) and the habitat and thus the gas accelerates? An accelerated charged particle should emit light, but then again it is only accelerated seen from the outside. The gas shouldnt move (much) in relation to the habitat. So would it only emit photons away from the habitat? head scratch

    Perhaps someone can lift my confusion. ^^ regards pyriel

  • Oct. 1, 2021, 11:27 p.m.

    Anti-Gravity No, Anti-Mass Yes?

    Higgs field shielding?
    QFD mass shifting using quantum?

    Would love to see this topic explored.

  • Oct. 14, 2021, 3:52 p.m.

    hi, sorry being new here and watched and re watched the rogue planet video and have a few questions maybe someone can help me a bit.
    here we are:
    Isaac Arthur is saying that there could be a Ocean covered with thick Ice, and over it parts of the liquefied atmosphere with liquid nitrogen and
    other parts of it. so i am wondering about how deep this could be?
    would it be more like a swamp or some kind of shallow sea in the probably existing lower regions and the ice standing out in the part of the
    atmosphere witch is not liquefied or could it cover the whole planet, assuming some earth like planet conditions and mass.

    Thank you for your help
    and please excuse my English, still not my mother tongue...