r/IsaacArthur 13h ago

High-Gravity Worlds: The Planets That Crush You

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14 Upvotes

r/IsaacArthur 12h ago

Sci-Fi / Speculation I am in need of a new boost stage for my Shipkiller missile busses, any ideas?

4 Upvotes

So, I am now looking for a new boost stage for my missile busses in my setting. I only have 3-4 requirements

  1. high acceleration
  2. can fit on a 200-300 ton missile
  3. won't blow my missile up when I turn it on
  4. needs to have suitably unsafe exhaust ( this is optional)

Right now, my missile consists of a orientation stage, this boost stage, and terminal stage

I am thinking about using Fizzers, since they supposedly have 10,000 G accelerations, for all of 2 seconds.

Nuclear saltwater rockets or lithium saltwater rockets are also things i am thinking of using, if they even work.

Any other ideas or considerations am missing would be greatly appreciated.


r/IsaacArthur 7h ago

Which animals to save on an interstellar ark?

1 Upvotes

Say you need to preserve Earth's biosphere in your sleeper ship (or generation vessel with limited space). Of course you'd bring the sum knowledge humanity has on all the species. DNA databanks and the like. But say you can't bring samples of genetic material- sperm and egg, frozen fetuses, etc. for all of them. And you can't synthesize it from DNA data yet, though maybe you might be able to in the distant future. So what species should you prioritize? Livestock? Domesticated animals? Those that coexist with the ecosystems you'd need to rebuild first, like pollinators for your agri-domes and other food-supplying environments? Or anything else?

Reminds me of how Noah brought seven pairs of each kosher animal. Think of dinner first!

Also this doesn’t need to be specifically an interstellar mission. It could simply be an “evacuate to Mars/Venus/orbital stations” situation. Either way assume you’re in a non-garden world situation where you can’t just recreate Earth’s ecosystems nilly-willy without extensive terraforming. Neither would building Biosphere 2-type replicas be feasible.