"This is an image I took last Saturday showing Saturn and two of its moons—Titan and Rhea—setting behind the tree line of a mountain called Cerro de la Mitras located in Monterrey, Mexico ...

NIIGATA--The tree line near the halfway point of 3,776-meter Mount Fuji, considered the uppermost limit where such plants can thrive, has steadily climbed over the past four decades and global ...

The tree line, also known as the timberline ... "The trees are a valuable 'time capsule' that tells us not only about these mountain forests 6,000 years ago, but about the climate conditions ...