Matt Williams has an interesting article at Universe Today on the Aurora hypothesis, a part of a long running series on the Fermi Paradox: if alien civilizations are numerous, where are they? The Aurora hypothesis is that the reason we don't see signs of alien colonization throughout the galaxy is that most biospheres are not … Continue reading The Aurora hypothesis
This is a pretty good description of the Kardashev Scale of civilization energy usage. https://www.youtube.com/watch?v=rhFK5_Nx9xY I initially thought the video overestimated how close we are to being a Type I civilization, but then I remembered that the whole scale is logarithmic, so maybe not. It also mentioned that we might "choose" to build a megastructure … Continue reading What do alien civilizations look like from afar?
A new analysis is getting some attention, one claiming to have refined the old Drake equation and produced firmer numbers, leading to this conclusion: Under the strictest set of assumptions – where, as on Earth, life forms between 4.5bn and 5.5bn years after star formation – there are likely between four and 211 civilisations in … Continue reading 36 civilizations in the galaxy?
Science News has a short article discussing a calculation someone has done showing how small the volume of space examined by SETI (Search for Extraterrestrial Intelligence) is relative the overall size of the galaxy. With no luck so far in a six-decade search for signals from aliens, you’d be forgiven for thinking, “Where is everyone?” A … Continue reading SETI vs the possibility of interstellar exploration
Marc Defant gave a TEDx talk on the improbable events that had to happen in our planet's history for us to eventually evolve, along with the implications for other intelligent life in the galaxy. http://www.youtube.com/watch?v=_nCOhrYV7eg I find a lot to agree with in Defant's remarks, although there are a couple points I'd quibble with. The … Continue reading The extraordinary low probability of intelligent life
Today's SMBC highlights something about humanity that is often overlooked, something that any extraterrestrial intelligence that builds a civilization would have to have. Click through for hover-text and red button caption. Source: Saturday Morning Breakfast Cereal - The Mammal Conspiracy We often talk about the intelligence of dolphins, whales, cephalopods, elephants, and other species. But … Continue reading The necessity of dexterity for civilization
For those interested in the post about finding advanced civilizations in other galaxies by their heat emissions, Paul Gilster at Centauri Dreams has a write up about the study, including links to additional material as well as the actual paper. I found that this part clarified the seeming contradiction in the Science Daily article. The currently reported work … Continue reading G-HAT (Glimpsing Heat from Alien Technologies)
At first, this article seems like a bit of a downer: Search for advanced civilizations beyond Earth finds nothing obvious in 100,000 galaxies -- ScienceDaily. After searching 100,000 galaxies for signs of highly advanced life, a team of scientists has found no evidence of advanced civilizations there. The idea behind the research is that, if … Continue reading Searching for advanced civilizations in other galaxies: 50 possible candidates found?
Ethan Siegel has an excellent post up exploring the possibility of extraterrestrial civilizations. With hundreds of billions of stars (visible, above, in infrared wavelengths) in our galaxy alone, and literally trillions of planets around them, we have many, many chances for life to have evolved similarly to how it did here on Earth. With at … Continue reading The faster interstellar travel is, the further away intelligent aliens are