Started by Unbeliever, May 13, 2019, 07:53:47 PM
Quote from: Unbeliever on May 13, 2019, 07:53:47 PMThis is the best Hubble image ever made!https://www.youtube.com/watch?v=8EKl9aF4NnMThis is called the Hubble Legacy Field, andyou can find the image here:http://hubblesite.org/image/4492/news
Quote from: drunkenshoe on May 14, 2019, 07:34:59 AMMy little brain...oh
Quote from: Shiranu on May 14, 2019, 01:52:13 AMI find it baffling that anyone can see this and then think we are the only life in the universe... and assuming there are multiverses, the only life in all of those as well.
Quote from: Gawdzilla Sama on May 14, 2019, 07:45:24 AMhttps://www.prosperosisle.org/spip.php?article874
Quote from: Unbeliever on May 14, 2019, 01:34:36 PMMax Tegmark, in his book Our Mathematical Universe, gives an interesting argument for no other life besides ours, based on something called a uniform logarithmic prior. I don't have the book in front of me, so let's see if I can do justice to the argument.Since we don't know how near is the nearest other intelligent life, then it could be anywhere from 10^21 meters (in our galaxy) 0r 10^100, or 10^1000, or any other order of magnitude, and they are all, a priori, equally likely. Since our observable universe is 10^26 meters, it's unlikely that the correct number is between the 10^21 meters and 10^26 meters, since such a small range is too small to be statistically likely, as any larger order of magnitude is equally likely.I hope that's clear, if not I can find the book and give it in Tegmark's words.
Quote from: Unbeliever on July 16, 2019, 07:52:19 PMI don't have an equation, but I suspect there are none other than us, at least in our galaxy. I await observations, something better than Tabby's star.
Quote from: Minimalist on July 16, 2019, 10:09:37 PMThe first radio broadcasts were in the early 20th century. Prior to that how would anyone have known we were here even if they were listening? Even now, the earliest weak radio signals can be no more than 110 light years from earth which means anyone outside that range has no chance of knowing we are here. Assuming that evolution follows the same basic path ( a rather large assumption!) that means that any society we could hope to contact would have to have reached roughly the same technological level as us at about the same time ( +/- 100 years.) That's asking a lot.
Quote from: Gawdzilla Sama on July 17, 2019, 03:56:36 PMThe 19th C. "industrial pollutants" were wood and coal smoke. Nothing technological about that, both had been around for a good long while.
Quote from: trdsf on July 17, 2019, 04:11:18 AMActually, assuming a technology capable of resolving Earth independently of our sun (perfectly plausible, we're very nearly to that point ourselves), the presence of a technological civilization here could be inferred out to a radius of about 200ly, give or take. Spectrographic analysis would reveal pollutants in the atmosphere as the Industrial Revolution got going, and any ETI would be able to observe their growing concentration over time.