There were various proposals for using the original nuclear pulse Orion ships for interstellar journeys. Before you condemn it for using nuclear bombs, and thus being dangerous, I think that once the general public find out how dangerous antimatter really is, they will embrace pulse ships with open arms.
I didn't expect this from a NASA forum. I figure you mostly aren't scientists, but neither readers of science fiction?
http://www.projectrho.com/rocket/supplement/dvNomogram01.pdfFusion can do interplanetary 1g brachistochrones with somewhat reasonable mass ratios. It definitely can't do interstellar brachistochrone trajectories. You need antimatter or laser sails for that. It gets better at ultrarelativistic speeds because proper acceleration isn't the same thing as coordinate acceleration, and proper velocity increases exponentially with rapidity in that range. But getting to that speed range is a pure fantasy to begin with.Edit:Ah, this got lifted by necroposting.Quote from: Esteban on 12/14/2017 07:44 amI didn't expect this from a NASA forum. I figure you mostly aren't scientists, but neither readers of science fiction?This isn't a nasa forum. It's a spaceflight forum that has nasa in its name because most of it is devoted to US spaceflight.
Sorry, didn't know necroposting was bad form.
imo VR is the only "sensible" resolution of the Fermi paradox (& countless other issues). Stars are just lights in the sky. Only a few bits each to render(for a naked eye). A few million(if looking through a telescope). & none if nobody's looking etc. The "physical" universe may only be for us(at least for the time being).
What is a virgin galaxy?
Quote from: Mr. Scott on 04/12/2018 09:09 pmWhat is a virgin galaxy?Virgin meaning "untouched;" i.e., "virgin forest." In this context, it means "un-colonized," in other words, that no species has moved from their home star system to another.
Make your own star... [and] steer them around the galaxy.
The whole "we should be able to see type II civilizations" thing is sooooo 20th century. Even the argument for Dyson spheres seems weird when you imagine working nuclear fusion. Why bother with bottling a star if you can engineer an artificial one that is better?
We know a lot of the physics of what a universe that evolved from that past would look like, and that matter all seems to still be here, exactly matching the signatures of what we expect dumb matter to look like.
Quote from: KelvinZero on 04/13/2018 03:20 amWe know a lot of the physics of what a universe that evolved from that past would look like, and that matter all seems to still be here, exactly matching the signatures of what we expect dumb matter to look like. No it doesn't. Our models of "what the universe should look like" are based on what we can see. If we were looking at a living universe we'd make completely wrong predictions and be surprised over and over again as we observed more and more - and that's basically a short history of modern cosmology. The only way our models work is by introducing matter and energy we can't observe!
QuantumG is talking about 'dark matter' which is exactly what he described, and yes, it's a real scientific theory. Look it up