This view combines hundreds of images taken during the first several weeks after NASA's Phoenix Mars Lander arrived on an arctic plain on Mars. The landing was on May 25, 2008. The discovery of water ...

Throughout the history of rocketry and spaceflight, rocket engines have always used two distinct fuel types, and each has its own advantages and disadvantages. Liquid-fueled rockets store fuel and ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. The optics may not be good, but the facts tell a different ...

Going straight up is hard. It takes a lot of energy. For those of us who enjoy hiking, cycling or running, hills are the bane of our existence. The hills sap us of our strength and speed, and they ...

We don’t need any advanced propulsion to get to Mars,” says Robert Zubrin, founder of the Mars Society and the astronautical engineering company Pioneer Astronautics. “We can do it with chemical ...