Solar Impulse grounded in Hawaii for repairs

The sun-powered Solar Impulse 2 aircraft has been grounded in Hawaii, its crew said Saturday, after a grueling five-day, fuel-less flight across the Pacific Ocean overheated its batteries.

New Image of Pluto: 'Houston, We Have Geology'

It began as a point of light. Then, it evolved into a fuzzy orb. Now – in its latest portrait from NASA's New Horizons spacecraft – Pluto is being revealed as an intriguing new world with distinct surface features, including ...

As habitats vanish, migratory birds flock to N. Korea shores

To the untrained eye, it's just a lot of birds on an otherwise deserted stretch of muddy, flat coastline. But for ornithologists, North Korea's west coast is a little piece of paradise each spring—and both the birds and ...