Recent content by AllanR

Clark's novel The City and The Stars had effective immortality. There was one large constraint however, humanity was limited to a single city. People would live for a thousand or two years, then edit their memories and digitally store them, and would be reborn some random time in the future...

from chat-gpt: The Eternal Traveller Summary: In a universe that is infinite, unbound, isomorphic, and has zero curvature, all possible places and times coexist together. From the perspective of a photon, there is no travel time, and a being in the form of light could instantly travel to all...

Radio Free Albemuth was a pretty good adaptation

It does mean that you only have to have collision protection on one side instead of two. Also make radiation protection easier.

neither of these grow on trees (herb and shrub)

It is wrong. I was only thinking of momentum and completely ignored gravity. They might be more common than we suspect? from https://hubblesite.org/contents/news-releases/2022/news-2022-001.html "Astronomers estimate that there should be 100 million black holes roaming among the 100 billion...

Gravity assist around object will only help you so much. Your high approach velocity will mean you only have a short time close to the object, and you still have to endure the g-force as you change direction. (and if your ship is only designed to take acceleration force along the long axis, the...

Hi again. Is it plausible that an ice giant like Neptune could be shattered by a collision such that it keeps a tight debris field for a few hundred thousand years before recoalescing as a planet? In my story the characters hide in a debris field and refine the ices for fuel. Also, if the...

Maybe for marathons it matters? Like how bike racers shave the hair off legs. (they can save a minute or more on a 40k race) https://www.active.com/cycling/articles/will-shaving-your-legs-make-you-a-faster-cyclist?page=1

If the radius is large, say a kilometre, or 6k circumference, and spinning at 1rpm to give about a g. How could I calculate how much energy difference to walk all around it in either direction?

Ah I think I see. I would calculate the walking speeds acceleration the same way as I calculate it for the station a = 4 π² r n². So if I manage to run against the spin at the same rate of the spin I would stand still and have no gravity?

When moving around a circular spinning space station (doughnut shaped) Is there any difference in the direction one goes? Is the energy expenditure the same or different? Would one ever feel like one is climbing? My gut feeling says no, as the person walking has the angular momentum matching...

Thanks for the reply. Nice I love hearing about strange objects in our solar system. Both Janus-Epemethiu and Patroklus look fascinating. Will have to include them in a story :)

Hi again How much mass would a centaur need to have Lagrange points? (is a centaur of this size plausible?) In the story I'm working on a massive centaur passes near Jupiter's 4th Lagrange point, such that the centaur's Lagrange point and Jupiter's overlap. Could the centaur come at an angle...

Ship is traveling at .4c. It is medium sized, about 1500 tons displacement. One way I want to slow down is using a parachute of sorts to use the drag from the interstellar medium. This doesn't have to be the majority of the deceleration, just a small part. A percent a year is fine. What I...