Portal Space Systems opens its doors for a sneak preview of its solar propulsion system
Bothell, Wash.-based Portal Space Systems shows off the lab where its solar thermal propulsion system will be developed.
7 jaw-dropping images of Milky Way Galaxy captured by NASA
The Milky Way is a barred spiral galaxy, about 100,000 light-years across, containing roughly 200 billion stars, and our solar system is located about 26,000 light-years from its center. It takes ...