Arstechnica: When it comes to the available sources of renewable energy, most of the focus is on the Sun, since all the other sources, like wind and biomass, are ultimately derived from it. But solar presents its own challenges, since it's most easily converted into heat or electricity, and we can't store either of these at a high enough density for uses like transportation. This explains why there's a lot of effort going into things like biofuels and using electricity to produce hydrogen. Each additional step, however, involves a potential inefficiency.
The supermassive black hole is 40 million times as massive as the sun and powers a quasar that existed 700 million years after the Big Bang.
Vision Pro is here and it’s a surprisingly capable device. Apple has also loaded the headset with a ton of options and features that aren’t obvious at first glance.
Engineers expect to lose contact with the private US moon lander Odysseus on Tuesday, cutting short the mission after its sideways touchdown last week.
