Halep faces Ostapenko in French Open final

first_imgAfter her defeat in last year’s final, Simona Halep hopes to go one better and be crowned women’s French Open champion this afternoon.Standing in her way at Roland Garros is unseeded Latvian Jelena Ostapenko.Halep is a strong-favourite to win and become the new world number one, the Romanian is not feeling the pressure Photo: © pixabaylast_img

NASA rover catches big whiff of methane on Mars—but where did it

first_img By Paul VoosenJun. 24, 2019 , 12:35 PM NASA/JPL-Caltech/MSSS NASA rover catches big whiff of methane on Mars—but where did it come from?center_img Last week, NASA’s Curiosity rover caught its strongest whiff yet of martian methane. While exploring a clay-rich region of the Red Planet, the rover detected the highest levels of the gas it has ever observed, some 21 parts per billion. That’s three times the level it sniffed out for several months in 2013.The finding, if it holds up, will only deepen the mystery of methane on Mars. Methane can be a byproduct of microbial life, but it can also be produced through geological reactions or created in the atmosphere from carbon in solar system dust. Until now, the large spike seen by Curiosity in 2013 has never been repeated; instead, the rover has documented minute levels of methane that shifted with the seasons. Adding to that mystery, last year the European Space Agency’s Trace Gas Orbiter (TGO), which started scanning Mars’s atmosphere for methane in 2016, did not detect any of the gas, despite carrying instruments far more sensitive than Curiosity’s.Curiosity’s scientists say it might be possible for thousands of small seeps in Mars’s surface—none of which would be detectable from orbit—to release the gas. Follow up work with the TGO and Mars Express, another orbiter, will reveal whether their instruments picked up this latest martian burp. If they did, they might give scientists some sense of the plume’s origin and how long methane lasts in the planet’s atmosphere.last_img read more