The US Space Force has confirmed that a meteor that struck Earth near Papua New Guinea in 2014 was not from this Solar System, making it not only our earliest-known interstellar visitor, rather than 2017’s ‘Oumuamua—but also the first known object of its kind to have crashed into the Earth. Thisread more

The levels of carbon dioxide found in the atmosphere in modern times have been found to be nearly ten times higher than any other time since the extinction of the dinosaurs, 65 million years ago. The event that came the closest to today’s CO2 levels, the Paleocene-Eocene Thermal Maximum (PETM), occurred 55.5 million years ago, where a spike in greenhouse gasses caused global temperatures to increase by 5–8 °C over what we’re experiencing today. While the existence and cause of the PETM is well established, the source of the massive amount of CO2 that caused the temperature spike has been a complete mystery to more