Sixty-six million years ago, a huge celestial object struck off the coast of what is now Mexico, triggering a catastrophic “impact winter” that eventually wiped out three-quarters of life on Earth, including the dinosaurs. A pair of astronomers at Harvard say they have now resolved long-standing mysteries surrounding the nature and origin of the “Chicxulub impactor.”  Their analysis suggests it was a comet that originated in a region of icy debris on the edge of the solar system, that Jupiter was responsible for it crashing into our planet, and that we …

The European Space Agency (ESA) said Tuesday it is recruiting new astronauts for the first time since 2008 and encouraging women and people with disabilities to apply.The announcement Tuesday came in a virtual news briefing that included ESA Director General Jan Worner and current agency astronauts. Worner said while ESA still has astronauts from the last selection process, it needs new astronauts to “secure a continuity” and ensure a smooth transfer of knowledge from one class to another.Worner said the agency is looking to add up to 26 permanent and reserve …

The World Health Organization and other aid agencies are moving quickly to try to gain control over a new outbreak of the deadly Ebola virus in Guinea. Guinea is one of three countries that was affected by the 2014 West African outbreak, the largest in history.The outbreak in Guinea was detected February 14, just one week after a new outbreak of Ebola was identified in the eastern Democratic Republic of Congo.  The two outbreaks are unrelated, but the World Health Organization says both face similar challenges and both can benefit …

For the first time, wild camels have been sold on Australia’s leading online livestock auction. Australia has the world’s largest herd of feral camels that were introduced in the 1840s. Auctioneers in Australia weren’t sure if the group of 93 Arabian camels would sell online, but they all sold for as much as $230 each.  Most were bought to keep prickly weeds under control on farms, and there was interest from domestic meat traders. The animals had been rounded up, or mustered, by helicopter on a remote property in Queensland.  Scott Taylor is a selling agent who helped arrange the auction. He says it took …

Colombia is set to begin immunizations against COVID-19 after receiving its first shipment of vaccines on Monday. President Ivan Duque and his health minister accepted the first 50,000 doses of the Pfizer vaccine and said frontline health care workers and the elderly will be the first to get their shots. Colombia has a contract to buy 10 million doses from Pfizer and it expects to soon receive 1.6 million doses from other laboratories. The government says it intends to vaccinate 35 million people this year, including hundreds of thousands of Venezuelan migrants and refugees. Colombia is one of the last countries in Latin America to start vaccinations, behind Ecuador, Panama and Chile. President Duque said his administration was hesitant to start immunizations until it …

College and university students are low on the list to receive COVID-19 vaccines, according to recent estimatesUnless students are classified as essential workers — such as medical, nursing, medtech or student teachers — or have a health condition — such as human immunodeficiency virus or cancer — they are not likely to receive the COVID-19 vaccine until at least April, Imani Bell, a senior at the University of Delaware. (Courtesy of Bell)“I hope that the rollout starts to pick up and that everyone has access,” said Bell. “It doesn’t make …

The deaths of two Colorado men caught in avalanches and a third in Montana over the frigid Presidents Day weekend show how backcountry skiers and others in the Rocky Mountain wilderness risk triggering weak layers of snow that have created the most hazardous conditions in a decade, forecasters say. At least 25 people have been killed in avalanches in the United States this year — more than the 23 who died last winter. Typically, 27 people die in avalanches in the U.S. annually. Avalanche forecasters say they have rarely seen the danger …