Astronomers propose a new theory to explain Saturn's unusual rings.
Volcanologists use every device at their disposal to monitor Sicily's Mount Etna.
Although 2010’s ozone hole was sizeable, Earth’s ozone layer is on the mend.
A huge galactic smash-up may have formed the galaxies nearest us.
Use of nitrogen fertilizer is radically impacting Earth's nitrogen cycle.
Astronomers say a black hole recently formed in a nearby galaxy.