Where does the solar system end and interstellar space begin? That's a question scientists have been working to answer using ...

Add Yahoo as a preferred source to see more of our stories on Google. An artist's depiction of the heliosphere, the Sun's region of influence in space. Little is known of the actual shape of the ...

The sun warms the Earth, making it habitable for people and animals. But that's not all it does, and it affects a much larger area of space. The heliosphere, the area of space influenced by the sun, ...

The probe is set to become the third human-made object to leave the solar system, but it must first cross this mysterious ...

NASA’s New Horizons spacecraft is heading toward one of the most significant milestones in modern space exploration. After ...

Surrounding our solar system is a natural and enigmatic cosmic shield called the heliosphere — and a new mission has launched to help astronomers better understand it. Created by the solar wind, a ...

NASA's New Horizons found the solar wind slows as it nears interstellar space, helping improve models of the solar system's ...

This is the 24th teleconference of the panel. The entire meeting will be in closed session. Please visit the project website for additional information including upcoming meetings, as it becomes avai.