For more than fifty years, scientists have known that the Earth hums. We can't hear the sound as it's at a frequency 10,000 times lower than our hearing threshold but new research suggests that it's coming from the ocean floor. Scientists from the Paris Institute of Global Physics analyzed data from earthquake sensors on the Indian Ocean floor and found the familiar and constant oscillations of between 2.9 and 4.5 millihertz. From National Geographic:
"To better understand where the signal comes from, we believe that observing oscillations from the ocean bottom can help," says co-author Martha Deen...
Since early observations, a number of studies have hypothesized that the Earth's free oscillations are a side-effect of the pounding of ocean waves. Other research suggests the hum could originate from atmospheric turbulence, or the wind motions around the globe, cued by storms. The current study says turbulence could account for part of the vibration, leading the rest to be fueled by ocean waves...
By studying the Earth's hum signal from ocean-bottom stations, scientists can map out a detailed landscape of the Earth's interior. Currently, they can only look at the inside of the planet during earthquakes, which limits studies to certain times and areas. And when looking at seismic activity from land monitors, researchers can't chart places far removed from islands and land masses. But the hum signal, droning and constant, can be detected across the world.
Caltech theoretical physicist Sean Carroll, author of Something Deeply Hidden: Quantum Worlds and the Emergence of Spacetime, explains the concept of a “dimensions” at five different levels of complexity. Dr. Carroll sure has a big brane.
In 1936, the Tasmanian tiger (Thylacinus cynocephalus) was declared to be extinct. Yet in the last three years, there have been eight reported sightings according to Tasmania’s Department of Primary Industries, Parks, Water and Environment. I hope it’s true. From CNN: While stories abound that some continue to live in the remote wilds of Tasmania, […]
Who doesn’t love a free meal? From Nautilus Live: During the final dive of this year’s Nautilus expedition season, our team discovered a whale fall while exploring Davidson Seamount off central California’s coast with researchers from Monterey Bay National Marine Sanctuary. The skeletal remains of the whale lying on its back are estimated to be […]
We can’t all go through life with just a pair of sneakers and flip-flops. Sometimes, you have to invest in a pair of high-quality dress shoes. However, you’ve probably discovered that high-end footwear almost always comes with eye-popping price tags. You’ve got to compromise on second-hand or just suck it up and take out a […]
We have a theory about those throw blankets that are barely big enough to cover your legs. The only people who seem to make them or use them are grandmothers, and the blankets are only that small because Nana got bored halfway through the sewing job. Look, we’re sure she means well. But if you […]
Remember when the default state of your online presence was anonymity? That’s not so clear-cut anymore, and the worst part is you may not even know who is using your data or what they’re using it for. Small wonder that so many people are choosing to surf through virtual private networks. VPNs filter web access […]