As NASA returns humans to the Moon and then heads out to Mars, a new type of astronaut will be required to explore these worlds. Let's called them "expeditionary astronauts".
Wind has shaped the face of Mars for millennia, but its exact role in piling up sand dunes, carving out rocky escarpments or filling impact craters has eluded scientists until now.
Earth is bombarded every year by rocky debris, but the rate of incoming meteorites can change over time.
A new assessment of NASA's record of global temperatures revealed that the agency's estimate of Earth's long-term temperature rise in recent decades is accurate to within less than a tenth of a degree Fahrenheit, providing confidence that past and future research is correctly capturing rising surface temperatures.
Most people behave differently when under extreme pressure. Carbon and ice are no different.
The sun's first rays peek above Earth's limb highlighting the thin blue atmosphere during an orbital sunrise as the International Space Station orbited 255 miles above Indonesia.
