[vidarh]

They wouldn't need generation ships. You "just" need sufficient tech to put engines on a suitable astroid and accelerate it to a decent fraction of c; it only needs enough logic to fine tune the path. An invasion force is horribly inefficient vs. just slamming a lot of mass at someone at high enough speed.

And it only takes one massively paranoid, xenophobic species lobbing big rocks at people to ruin the entire neighbourhood.

I don't think camouflaging necessarily means not leaving your gravity well, but if there's someone lobbing big rocks at potential threats, then the only ones exploring will be the ones powerful enough or good enough at hiding for us to be unlikely to spot them unless they want us to. Everyone else will be dead.

It's one of the more compelling answers to the Fermi paradox to me, while at the same time being profoundly depressing. But it's less depressing than the chance that there might not be any other civilizations.

[rsync]

It's funny, I just spent the last 18 months deep-diving into the history and literature of World War 1.

"And it only takes one massively paranoid, xenophobic species lobbing big rocks at people to ruin the entire neighbourhood."

Ahh, Germany ...

[vkreso]

> They wouldn't need generation ships. You "just" need sufficient tech to put engines on a suitable astroid and accelerate it to a decent fraction of c; it only needs enough logic to fine tune the path. An invasion force is horribly inefficient vs. just slamming a lot of mass at someone at high enough speed.

I misplaced a link and the name of an author of a sci-fi novel in which space battles are much more science based than the usual laser-tag shoot off. I'll dig through my bookmarks and hopefully post the name in the reply when I get to my pc..

I think there was also a reddit thread about it sometimes in the past.

[btouellette]

The Remembrance of Earth's Past series by Liu Cixin? It also has the "lurker" theory of cosmic sociology being discussed in this thread.

[pavel_lishin]

Isn't that only a problem if you're completely planet-bound? If you want to play it safe, you shouldn't put all of your eggs into a single basket anyway.

[nojvek]

Correct, but while exploring the universe, doing it undetected is actually a great strategy. Imagine self replicating nano bots that embed themselves into asteroids. Everything thinks its just big rocks flying in space that sometimes smash into planets. But its a strategy to slowly colonize the galaxy and put a mark everywhere. Kind of how plants spread their pollen into the wind or have bees and butterflies do their dirty work.

[detritus]

An interesting view on this perspective can be found in the sci find novel 'the killing Star'

https://en.m.wikipedia.org/wiki/The_Killing_Star