"We do not yet know how life first formed on earth, but no scientist argues that it can never be explained in material terms. How prevalent is life throughout the universe? We now know that there are likely even more planets than there are stars. So, is life in the cosmos prevalent or rare? Either answer yields profound implications."
"The rate of growth of new technologies is often proportional to past knowledge, leading to an exponential advance over time. This explosive process implies that very quickly after a civilization reaches technological maturity, it will develop the means for its own destruction through climate change, for example, or nuclear, biological or chemical weapons. Developments of this type, over mere hundreds of years, would appear abrupt in the cosmic perspective of billions of years. If such self-destruction is common, this could explain Fermi’s paradox, which asks “where is everybody?”—and...
"Active galactic nuclei (AGNs) --- powered by supermassive black holes at the centers of most young galaxies --- may have put the quash on life’s evolution, says one new study."
"Hundreds of astronomy enthusiasts filled every available seat to listen to Astronomy Department Chair Abraham “Avi” Loeb describe recent innovations in the search for life beyond our solar system."
Avi Loeb's latest Scientific American blog, "Scientific discoveries substantiate our awe when faced with the richness and universality of the laws of nature. But science falls short of explaining this natural order and why it exists in the first place."
“Not all discoveries come from new observations,” says Pete Worden, in a comment referring to original thinking as applied to an existing dataset. Worden is executive director of the Breakthrough Initiatives program, which includes Breakthrough Listen, an ambitious attempt to use SETI techniques to search for signs of technological activity in the universe. Note that last word: The targets Breakthrough Listen examines do extend to about one million stars in the...
"Interstellar distances are vast. It takes light four years and three months to cross the distance to the nearest star, Proxima Centauri, which hosts a habitable planet, Proxima b."
