Recent comments in /f/space

Head_Weakness8028 t1_jdxzaqc wrote

Reply to Why don’t we use Venus as a dumpster? by Postnificent

I remember when I was a kid, I asked my dad, something similar of why don’t we just shoot our garbage toward the sun. And his reply has stuck with me to this day. He said that by the time our species is advanced enough that shooting our garbage out of Earth’s orbit and into the sun is feasible, we should already be properly breaking down 100% of our waste into something usable. And he used life itself as an example we eat we drink we breathe, and we expel other usable components into the environment. Technically, we should produce no “waste“.

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theboehmer t1_jdxxymc wrote

Reply to comment by jaibhavaya in Are galaxies just giant accretion disks around super massive black holes? by darthvadercock

From what I understand, black holes are incredibly massive. They formed systems that added to the collective mass(gravity), which in turn led to more and more collected mass(stars/dust/what not). Over billions of years it's now the galaxy we know. Our galaxy is in a group of galaxies that will evolve and attract until they merge, growing further.

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Head_Weakness8028 t1_jdxx36y wrote

Reply to comment by Trinull in Hello everyone . I am very interested in space megastructure. such as mckendree cylinder or bishop rings. But suppose we built it. How can a spacecraft dock with it ? Knowing that these huge structures rotate at huge speeds to generate a gravitaty similar to Earth's by Dizzy_Ad3353

Yessir, same as you would approach any moving body in space. By matching the bodies, velocity and vector, you would be stationary relative to the structure/object.

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SomeKindOfAdult t1_jdxwxtl wrote

Reply to Are galaxies just giant accretion disks around super massive black holes? by darthvadercock

Ethan Siegel (Starts With a Bang) gives a good explanation in his article about how some galaxies don't have supermassive black holes. (https://www.forbes.com/sites/startswithabang/2021/04/23/ask-ethan-why-doesnt-every-galaxy-have-a-supermassive-black-hole/?sh=55e747d23374)

>It’s an eminently reasonable thought that every galaxy in the Universe should have a supermassive black hole, especially considering that the processes that we think lead to their formation:

  • early, very massive stars form,
  • some go supernova and some directly collapse,
  • their remnants dynamically interact with the surrounding matter,
  • causing them to sink to the proto-galaxy’s center,
  • where they merge,
  • and then these “seeds” of supermassive black holes accrete matter and grow,
  • leading to what we observe today,

>ought to occur everywhere a galaxy is present.

So the answer is "sort of". While the super massive black hole isn't what holds the galaxy together, it may be that it was the seed that pulled the initial cloud of gas together to start the galaxy.

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Trinull t1_jdxq8c3 wrote

Reply to Hello everyone . I am very interested in space megastructure. such as mckendree cylinder or bishop rings. But suppose we built it. How can a spacecraft dock with it ? Knowing that these huge structures rotate at huge speeds to generate a gravitaty similar to Earth's by Dizzy_Ad3353

I would assume that ships would dock along the axis of spin. In the case of a mckendree cylinder the ship would dock at the far end of the cylinder (matching its rotation speed). For a bishop rind they would probably dock in the centre of the ring (once again matching its rotations speed) then catch elevators down to the surface.

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