By Victoria Bryan and Maria Sheahan BERLIN/FRANKFURT (Reuters) - The comet lander Philae may be uncommunicative at the moment, but the pictures and measurements it took after it touched down on a comet in November have shown scientists that the comet is covered with coarse material, rather than dust, and is harder than expected. European scientists celebrated an historic first when Philae landed on a comet called 67P/Churyumov-Gerasimenko in November after a 10-year journey through space aboard the Rosetta spacecraft. As it landed, Philae bounced and ended up in shadow, where its batteries soon ran out.
By Will Dunham WASHINGTON (Reuters) - Earth's magnetic field has been a life preserver, protecting against relentless solar winds, streams of charged particles rushing from the Sun, that otherwise could strip away the planet's atmosphere and water. "It would be a pretty barren planet without it," said University of Rochester geophysicist John Tarduno. Researchers on Thursday said evidence entombed in tiny crystals retrieved from the outback of western Australia indicates the magnetic field arose at least 4.2 billion years ago, much earlier than previously believed.
Scientists said on Thursday a comprehensive genetic analysis found that these populations are made up of two entirely distinct species, with those in Africa different from the others. The scientific name for the golden jackal is Canis aureus. The researchers proposed renaming those in Africa Canis anthus, or the African golden wolf.