While asteroids are more easily discovered with optical telescopes, radar images shine when it comes to details.

The system is aimed at making lunar missions as intuitive as a drive across town with apps such as Google Maps or Waze.

In every city studied, at least 20% of the urban area is sinking – and in 25 of 28 cities, at least 65% is sinking. The ...

President Trump has said he prefers diplomacy over Iran's nuclear program, but has not ruled out military action ...

The U.S. has strengthened its military presence in the region and threatened military action against Iran if no nuclear deal is achieved.