Scientific American

But what Reardon calls stability, others call persistence. Data compiled by Alexandrino and his team show half-lives (the amounts of time it takes chemicals to dissipate by half in the environment) ranging from a few days to 2.5 years for top-selling fluorinated pesticides. That is less ...

“Should the natural beauty of our night sky be protected under law, or should it be free and open for anyone to use as they see fit? That is a question many have grappled with for the past two years, since the arrival of so-called mega constellations. These vast groups of satellites ...

“A battle for the sky is raging, and the heavens are losing. Upcoming mega constellations of satellites, designed to blanket Earth orbit in spacecraft beaming high-speed Internet around the world, risk filling the firmament with tens of thousands of moving points of light, forever ...