“[T]here’s the uncomfortable fact that producing the 2 megajoules of laser
power that started the fusion reaction took about 300 megajoules of grid
power, so the overall process is nowhere near the break-even point. … [W]e’re
still left with major questions about whether laser-driven fusion can be
optimized enough to be useful.”
posted 12/22/2022 8:00pm ∞
“Matching the density of the two planets produces a model that has a bit over
10 percent of the planet’s mass composed of water. This, however, means
that about half the planet’s volume is water. … Due to the planet’s mass, the
pressure of the atmosphere would be immense and could create a layer of
supercritical water between the atmosphere and the ocean.”
posted 12/20/2022 8:00pm ∞
“[A] team of European researchers decided to model an event that should be
relatively uncommon: the two black holes didn’t start out in a mutual orbit but
happened to pass close enough to gravitationally latch onto each other. … The
models that produced a chirp that best matched the GW190521
signal saw a single pass that drew the black holes closer, followed by a single
rapid curve into the collision.”
posted 11/28/2022 8:00pm ∞
“[T]he earliest image indicates that it was roughly 100,000 Kelvin, which
suggests we were looking at it just six hours after it exploded. The latest
lensed image shows that the debris had already cooled to 10,000 K over the
eight days between the two different images.”
posted 11/24/2022 8:00pm ∞
“Here, rare earth extraction cleared 90 percent efficiency, taking
67 hours to get there. By contrast, leaching didn’t max out until
130 hours after extraction started, and its maximum efficiency was only
60 percent. Again, the extraction that used electricity had fewer
contaminating metals.”
posted 11/17/2022 8:00pm ∞