Our planet's protective magnetic bubble may not be as protective as scientists had thought. Small breaks in Earth's magnetic field almost continuously let in the solar wind — the stream of magnetic, energized plasma launched by the sun toward the planets — new research has found.Full story
NASA's Voyager 1 spacecraft, which launched 35 years ago Wednesday, surprisingly may have far more to travel before it leaves the solar system, researchers say. Full story
The sun-powered plane "Solar Wind" lands after a roundtrip journey from Switzerland to Africa without using a drop of fuel. NBCNews.com's Dara Brown reports.
An artist's conception shows how Mars' atmosphere was stripped away by charged particles from the sun.
