This is exactly what you do.

But, in metric :)

Just following your dialogue here enforces why I love HN comments x

But.. why?

Musk bandwagon-hopping? Investor bamboozlery? (Same diff?)

Is my borderline childish understanding of basic physics THAT off because I cannot see the value or utility (beyond a small smear of niche edge cases) of space-based compute?

- ed, disclosure: You seem to have edited your response whilst I was typing mine, adding in valuable links. Thanks!

(eg. https://www.youtube.com/watch?v=Rv8WfmI4TiI - loading screen for Dizzy)

I'd always assumed the sound would be great on the Atari because it was midi-compatible, but I was horrified to hear how tinny and bleepy the sound effects were in a game I knew from the Amiga.

Oh, to go back in time and use that in an argument at school with my ST nemesis, Andrew!

That said, I'm not sure what definition or list this site uses - as others have already pointed out, there are loads of castle missing I can tell, just from a few that I've visited across Italy.

How long's the longest voyage these days?

Mutinies aren't so common nowadays, but they were when ocean voyages were measured in months and years.

Like, to get a useful amount of people to Mars would be... the wealth of a first world nation for tens of years. Even using nuclear engines.

A generational megaship travelling at some small percentage of c to a nearby useful star (not even the nearest ones, which are all a bit shit)?

There's just nothing within our current projected reality that could even begin to accomodate that possibility.

Never mind the fact you'd need redunancy, and at least a few hundred years of testing to ensure that whatever mega project you could ultimately send wouldn't simply get vaporised halfway through, from realities unknown.

Future AI and a database of all of humanity's experience before launch might be enough to keep the generational populace amused and distracted for the entiriety of their meagre, trapped existence... .

Unless we have generational ships the size of small countries, I'm not sure the human brain - unaided and non-forcedly evolved to do so - would be able to handle essential incarceration in a series of metal tubes for its own and its descendents existences.

I still hold on to the idea that very long term we might make strides in our own solar system, but it is a depressingly-longer timescale than I always used to believe.

Unless we have some magic-level shift in our understanding of physics, we're never getting anything beyond Von Neumann probes to other stars, and even then we're talking thousands of years.

You might be interested in https://www.reddit.com/ .