Like many astrophysicists, Sara Seager sometimes has a problem with her perception of scale. Knowing that there are hundreds of billions of galaxies, and that each might contain hundreds of billions of
Saturn's moon Titan has been called the most Earthlike world found to date. It's the only other place in the solar system where stable liquid sits on the surface - seas of liquid methane flow into channels
Last flight-qualified space shuttle fuel tank in existence begins its journey to L.A. - Los Angeles Times
The journey began early Sunday when crews delicately pushed the 15-story space shuttle fuel tank from its outdoor perch outside NASA's Michoud Assembly Facility onto an ocean barge bound for Los Angeles.
While it didn't quite make it to crewed missions, the company will get a second life with resupply missions — and provide one significant advantage. When Sierra Nevada's Dream Chaser lost its chance at