Most scientists agreed that the Grand Canyon was carved 6 million years ago, until a study in 2012 used new data to argue that the canyon was actually 12 times as old. A new study tries to merge the old and new data into a single story.
Low levels of carbon dioxide in the atmosphere required trees to cut down their carbon dioxide consumption. As a result, the Earth's atmosphere and climate were stabilized over the past 24 million years, say scientists.
It was a euphoric moment for students at the University of London after they serendipitously spotted a powerful supernova in the M82 galaxy. The supernova is one of the closest to be spotted from Earth in recent decades, say scientists.