Recent content by PSKresearch

Just a few inches of water block a sufficient amount of UV rays while still allowing enough light for photosynthesis under the water. Also perpetual shady areas would get very little UV... like the shadows on the northern side of mountains & cliffs in northern latitudes, southern sides of...

Indeed, why is this guy a "senior writer" for a science website, if he has no idea of the implications of a light year? It will take 25,000 years for the signal to reach there, & another 25,000 for any reply to reach us. I knew this when I was about 9 years old.

Although there may not have been much oxygen dissolved in ancient oceans, & the atmosphere, water itself, H2O, is a molecule of 1/3 oxygen that can be easily split with just a small amount of electric current, lightning, UV rays, or gamma rays. So plenty of oxygen was available anyway. Oxygen is...