Scientists are using an array of instruments to detect other planets, some of which may harbor life—and others that most ...

But given that lunar spacecraft are solar-powered, how do they survive when they're cut off from the sun? For NASA's Lunar Reconnaissance Orbiter (LRO), which has been orbiting the moon since 2009 ...

In other words, if scientists can show that Earth's core contains a lot of helium-3, it will strongly suggest that the planet formed quickly, settling a long-standing debate about the birth of the ...