4 ms·
Not sure I buy this argument... here are some random thoughts on why: 1) Someone has to be first. Let's say that there is no filter, and every species that do
by piptastic 6y ago
Not sure I buy this argument... here are some random thoughts on why:
1) Someone has to be first. Let's say that there is no filter, and every species that doesn't destroy itself or get destroyed will eventually become technologically advanced to travel around meaningfully in space. There is a certain amount of time it will take for this to happen. Supposedly the universe is ~14B years old, and Earth is ~5B years old. It takes a certain amount of time for abiogenesis, a certain amount of time for life to evolve, and a species to emerge "victorious" long enough to start conquering the universe before the next extinction event. So we could be the "first", or the top 20% anyway, and it'll still take us a while for those top 20% to get anywhere where they can start detecting/traveling anywhere.
2) What is the maximum distance any extraterrestrial life could observe our technology/planet currently?
Space is huge, like uncomprehendingly huge... even if we could go anywhere ourselves right now, would we go visit every single planet everywhere without a reason to? And how long would that take? Maybe there hasn't been enough time for a civilization to a) detect us from 100s of light years away and b) travel to us. Maybe detection of life from far away is impossible past a certain point, but traveling there isn't (since it just takes time).
So I guess my thought is, yeah, we might not find life in our solar system, but we might. But even if we do, I don't necessarily think we'll get filtered out either.
- gaukes 6y agoI'm not so confident we're in the top 20%. Our galaxy is middle-aged. Our star is only 4.6 billion years old in a galaxy that is 13.51 billion years. There were several stars that blew up before we got the sun which means several systems and planets right in our neighborhood and that's just 1 star in the entire milky way. Even at 1% the speed of light, it would take 2 million years to travel across the milky way which, relative to the age of the galaxy, is nothing.
- piptastic 6y agoSure, but let's say you're on the other side of the milky way. You can travel at 1% the speed of light. Why would you come to Earth or anywhere near it? It takes 2 million years to get here, so unless you know something is there, that would be an insane trip to make.
- gaukes 6y agoWell, they wouldn't be looking for Earth specifically, they'd be looking for more resources which are everywhere. An intelligent and energy-hungry enough species would want to harness the power of every sun it can reach. That growth would be exponential because acquiring resources provides more energy which allows them to acquire more resources even faster. If an intelligent species doubled the number of stars they control every 2 million years, they'd have every star in the milky way in around 50 million years. That's still like 0.2% the lifetime of the galaxy.