Space

Two studies have independently estimated that the portion of the sky that the SETI program has searched for extraterrestrial life to date is analogous to having searched for fish in all of the Earth's oceans by sampling no more than a drinking glass (Tarter et al., 2010) or a large hot tub (Wright et al., 2020).

Which means that the Fermi paradox (the discrepancy between the lack of conclusive evidence of advanced extraterrestrial life and the apparently high likelihood of its existence) isn't a paradox at all.

References:

Tarter, J. C., Agrawal, A., Ackermann, R., Backus, P., Blair, S. K., Bradford, M. T., ... & Vakoch, D. (2010, September). SETI turns 50: five decades of progress in the search for extraterrestrial intelligence. In Instruments, Methods, and Missions for Astrobiology XIII (Vol. 7819, pp. 13-25). SPIE. https://doi.org/10.1117/12.863128

Wright, J. T., Kanodia, S., & Lubar, E. (2018). How much SETI has been done? Finding needles in the n-dimensional cosmic haystack. _The Astronomical Journal_, _156_(6), 260.

Aviator, diver, Etherean, nexialist, PhD in aviation ∩ climate science | Host of /diving /ethfinance /eth-staker /geopolitics /science /singapore /thomas

References:

Tarter, J. C., Agrawal, A., Ackermann, R., Backus, P., Blair, S. K., Bradford, M. T., ... & Vakoch, D. (2010, September). SETI turns 50: five decades of progress in the search for extraterrestrial intelligence. In Instruments, Methods, and Missions for Astrobiology XIII (Vol. 7819, pp. 13-25). SPIE. https://doi.org/10.1117/12.863128

Wright, J. T., Kanodia, S., & Lubar, E. (2018). How much SETI has been done? Finding needles in the n-dimensional cosmic haystack. _The Astronomical Journal_, _156_(6), 260. https://doi.org/10.3847/1538-3881/aae099

We've also only been looking for an extremely small period of time.

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I'm too smooth-braned (ha) to claim to fully understand it, but I've been reading pop-sci articles about it for a very long time. The idea of additional dimensions in which gravity "leaks" is appealing, but as I understand there's no observational evidence whatsoever despite decades of searching. What's your take?

This Christmas I have been reading a lot about the space (I will share the books soon). For me the feeling of emptiness that these two books present has no precedence. More over, learning about the last ideas from scientists regarding the wall and the branes cosmology makes me reconsider everything. What do you think about brane cosmology?

Yeah the Cosmos series is cool but this remains the best space documentary

https://youtu.be/FYJ1dbyDcrI

I mean, space is big. Like, really big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space.

Related:

Writer, podcaster, and commentator on foreign affairs and politics. Runs /dropglobalnews

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I mean, space is big. Like, really big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space.

Related:

https://warpcast.com/aviationdoctor.eth/0x95c45aa5

My high level take: If there were other life in an infinite universe at least one of them would’ve been advanced enough to make contact with us. Otherwise they already have and we are just unaware of it

To your point, there's certainly a case to be made as to whether we're making unnecessary assumptions when searching for extraterrestrial life (incl. whether we're looking at the right scale).

Europa is a good candidate for hosting life in our solar system given the amount of liquid water on it, but the ocean is stuck beneath a very thick layer of ice, so we can't know by just pointing a radiotelescope at it.

When it comes to intelligent life, we're assuming that they will emit some radiowaves that we can hear. But even in the history of Homo sapiens, we've only emitted radiowaves for about 100 out of 200,000 years, and we're arguably already starting to cut down on emissions into space thanks to fiber optics and satellites pointing down. It's easy to imagine that truly advanced civilizations may have ditched EM communications long ago

Maybe we should look at the bacteria instead of the fishes... There's plenty in a glass.

great analogy and human friendly to grasp

I once read it'd take about one million years to colonize the galaxy. Assuming the civilization continues to evolve and colonize worlds.

One million years isn't a lot in the grand scheme of things. But if you have conquered the galaxy, you're not going anywhere. And we've seen nothing like that.