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Cake day: June 9th, 2023

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  • Live Your Lives@lemmy.worldtoScience Memes@mander.xyzW Earth
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    3 months ago

    I believe you are looking for hydrostatic equilibrium. There don’t seem to be good answers for this online, but according to Robert Black on this Quora post:

    There isn’t a minimium per se but the generally accepted number for a mass to form into a sphere under its own gravity is 1/10,000th the mass of the Earth or 600 quintillion kg. As for size, it really depends on the composition of the body. The numbers are generally accepted to have a diameter of about 600km for a rocky body.

    A quintillion is 1 x 10 to the 18th and Phobos has a mass of 1.0659 x 10 to the 16th kilograms and a diameter of 22 kilometers.


  • Live Your Lives@lemmy.worldtoScience Memes@mander.xyzHere kitty kitty
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    3 months ago

    This meme is making these different disciplines answer questions they were never intended to answer. It’s like complaining that a school principal isn’t out there teaching students: that’s not their role and it would be silly to expect them to do otherwise.

    Philosophers would ask something like, “what is a cat?”

    Metaphysicians would ask something like, “how can we know that the cat truly exists?”

    Theologians would ask something like, “what does the Bible say about cats?”













  • Further into the article he says that, "It would be irresponsible of me not to mention that plenty of experts in cosmology or GR would not put it in these terms. We all agree on the science; there are just divergent views on what words to attach to the science. In particular, a lot of folks would want to say “energy is conserved in general relativity, it’s just that you have to include the energy of the gravitational field along with the energy of matter and radiation and so on.” "

    So energy is conserved on the whole, it’s just not conserved if you consider photons apart from their greater context.


  • “The planet’s atmosphere would feature something akin to Earth’s water cycle, but instead with sand cycling between solid and gaseous states. From the hotter, lower levels of the atmosphere, with temperatures close to 1,000C, silicate vapour would rise up, cool and form microscopic grains of sand, too small to see. Eventually, these clouds of sand dust would become dense enough that they begin to rain back down to the lower layers of the atmosphere. Below a certain level, the sand would sublime back into vapour, completing the cycle.”