With sapphire waterfalls, lava rain and orbits around dead stars, these distant worlds push the limits of what’s possible.

A technique to cool the planet, in which particles are added to the atmosphere to reflect sunlight, would not require developing special aircraft but could be achieved using existing large planes, ...

What can a 66-million-year-old impact crater reveal about the past and future of life on Earth? Dr. Sean Gulick explores the science behind one of the most dramatic events in Earth’s history, the ...