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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 ...

"These objects really could be anywhere in the solar system at any given time." One million alien visitors from another star system could already be lurking in the solar system. We aren't talking ...

Our solar system passed through a vast wave of gas and dust around 14 million years ago, dimming Earth’s view of the night sky. The wave may even have left traces in our planet’s geological ...

Light gases like helium hung around in the gas-and-dust nebula that formed the solar system for only a few million years. "It's very much debated how long it took the Earth to form," Olson said.