Two Reuse Leaders Extend Commitment to Sustainability, Join National Reuse Nonprofit NEW YORK, Aug.

In one of his songs Bob Dylan asks "How many years can a mountain exist before it is washed to the sea?", and thus poses an intriguing geological question for which an accurate answer is not easily provided.

It was ten years ago that NASA announced the discovery of photographs revealing gullies on the surface of Mars, something that suggested water might still be flowing on the surface of the planet.

NASA scientists will soon brush the dust off some Martian rocks that are practically bursting their seams to give their lively account of the red planet's past.

Astronomers have discovered that rocky, terrestrial planets might orbit many, if not most, of the nearby sun-like stars in the disk of our galaxy. These new results suggest that worlds with potential for life are more common that we thought.