Several times in the distant past, our home planet has been cleansed of its residents, with the exception of a few plucky survivors. Perhaps the best known and most spectacular extinction was that of the dinosaurs, caused when a meteorite six miles in diameter crashed into Earth about 65 million years ago. There was another […]
66 million years ago, the sudden extinction of the dinosaurs started the ascent of the mammals, ultimately resulting in humankind’s reign on Earth. Climate scientists now reconstructed how tiny droplets of sulfuric acid formed high up in the air after the well-known impact of a large asteroid and blocking the sunlight for several years, […]
The geologic shape of what were once shorelines through Mars’ northern plains convinces scientists that two large meteorites – hitting the planet millions of years apart – triggered a pair of mega-tsunamis. These gigantic waves forever scarred the Martian landscape and yielded evidence of cold, salty oceans conducive to sustaining life. “About 3.4 billion years […]
Sixty percent of U.S. seafood comes from Alaska. A profitable portion of this comes from the famed crab fisheries. New studies on the effects of ocean acidification due to climate change support a growing body of evidence that the future for Tanner and blue king crab stocks in Alaska waters is, at best, uncertain. “A […]