How far away is it? About 500 kilometers north. How deep? It's been partially filled in by erosion over the years, but I'm reading impact fractures down to nearly 2,000 meters. Comment or an asteroid? An asteroid, a large one. The tectonic analysis puts the impact at approximately 70 years ago. The poison rate? The geology was comprised primarily of baritium ore. The thermoshock would have created a radioactive cloud that probably covered the northern hemisphere for more than a year. They spent all those years getting here. Been for what?