Katy Perry launched her highly anticipated Lifetimes Tour in Mexico City with a spectacle of interstellar theatrics, ...

John Grunsfeld has a model of the Hubble Space Telescope on his bookshelf. It's right next to a model of a NASA space shuttle, which delivered Hubble to space 35 years ago, and it's no secret why both ...

The hybrid motor combines solid fuel with gaseous oxygen to generate a powerful exhaust stream, mimicking the conditions of a real lunar lander.