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The enigmatic noble gas xenon has been presenting scientists with puzzling riddles for decades, including how it got to Earth, and then its apparent disappearance since arriving. But geochemists may have finally figured out where at least some of the xenon in Earth's atmosphere might have originated - and it's not from here. New results from the Rosetta spacecraft reveal that almost a quarter of the xenon found in our atmosphere may have come from comets. In addition to solving the long-held mystery about the origins of the rare gas, the new findings could help scientists understand how comets have potentially delivered other materials, such as water, to our planet. "The xenon isotopic composition matches that of a primordial atmospheric component," says Bernard Marty , lead author and geochemist at the University of Lorraine, France. "The present-day Earth atmosphere contains 22 percent cometary xenon." Much like helium and argon, xenon is

The first direct evidence of string theory? For the third time in two years, physicists have detected ripples in the fabric of spacetime, called gravitational waves, that Albert Einstein predicted the existence of more than 100 years ago with his theory of general relativity . "Einstein continues to rock, in the sense that we keep pushing the boundaries of his theory," Vicky Kalogera , an astrophysicist at Northwestern University and LIGO data analyst, told Business Insider. "It passes every test that we throw at it." The waves came from two black holes colliding together about 3 billion light-years from Earth, and a giant experiment called LIGO detected them . But that's just one of many discoveries that gravitational waves could bring us as new detectors go online and get upgraded . This article was originally published by  Business Insider .

"It was like I was in a bubble." For every ten people hit by lightning, nine will survive. But what are the lasting effects of being exposed to hundreds of millions of volts? Sometimes they'll keep the clothing, the strips of shirt or trousers that weren't cut away and discarded by the doctors and nurses. They'll tell and retell their story at family gatherings and online, sharing pictures and news reports of survivals like their own or far bigger tragedies. The video of a tourist hit on a Brazilian beach or the Texan struck dead while out running. The 65 people killed during four stormy days in Bangladesh. Only by piecing together the bystander reports, the singed clothing and the burnt skin can survivors start to construct their own picture of the possible trajectory of the electrical current, one that can approach 200 million volts and travel at one-third of the speed of light. In this way, Jaime Santana's family have stitched together some of