Are Mars volcanoes still active?
The rain of meteorites from space onto our planet over the last 500 million years may not have fallen in quite the way we thought. After analyzing 8,484 kilograms (18,704 pounds) of sedimentary rock from ancient seabeds, scientists have found that major collisions in the asteroid belt have not made any significant contribution to the number of meteorite impacts on Earth, as had been theorized. It's a discovery scientists say could help protect Earth from asteroid impacts in the future. "The research community previously believed that meteorite flux to Earth was connected to dramatic events in the asteroid belt," said geologist Birger Schmitz...