This driving tour moves through a layered city road in China, where lanes split beneath a pedestrian bridge and the skyline ...

Most stars in the cosmos are small, cool red dwarfs, yet the only intelligent life we know orbits a relatively rare yellow dwarf under a blue sky. That mismatch is at the heart of the “red sky paradox ...

Earth meets sky in this mountain town. The Appalachian bedrock here came from stardust and grew through geological processes ...