“When the moon is farthest away it’s known as apogee, and when it’s closest it’s known as perigee. On September 27, we’re going to have a perigee full moon – the closest full moon of the year,” Petro added. Read More »

There are just over three trillion trees on Earth, according to a new assessment. The figure is eight times as big as the previous best estimate, which counted perhaps 400 billion at most. Read More »