Imagining a visit to another planet just got a little easier, with the first data-based simulations of extraterrestrial sounds. Space probes have never captured actual sounds on other worlds, but a team led by Tim Leighton
of the University of Southampton in England has simulated such noises by calculating how sound would travel through various planetary atmospheres. For example, human vocal cords would vibrate more slowly in the dense atmosphere on Venus, but sound waves would travel faster, making the speaker seem smaller. The overall effect: something like a bass Smurf, Leighton says. List...
None of the scientists in the room so much as blinked when David Keith suggested saving the world with spy planes spraying sulfuric acid.Keith, a physicist at the University of Calgary in Canada, was facing an audience not likely to be shocked: nearly 200 other researchers, some of whom had their own radical ideas for fighting global warming. His concept was to spray a mist of sulfuric acid high in the stratosphere to form particles called sulfate aerosols, which would act like a sprinkling of tiny sunshades for the overheating Earth.Keith’s idea may sound outrageous, but it is just one of m... (p. 16)