Now we know how Elon Musk plans to get one million people to Mars.
The spaceship that SpaceX is building to colonize Mars could also take people out to Jupiter's ocean-harboring moon Europa and beyond.
Atmospheric oxygen levels have declined over the past 1 million years, although not nearly enough to trigger any major problems for life on Earth, a new study finds.
Good news on the alien-life-hunting front: The towering plumes emanating from Jupiter's ocean-harboring moon Europa appear to be real.
China's first-ever space lab will die a fiery death in Earth's atmosphere toward the end of next year, Chinese officials said.
The solar wind's evolution is finally coming to light, thanks to new analysis of observations from NASA's Solar Terrestrial Relations Observatory (STEREO).
Pluto may be sharing its atmosphere with its largest moon, Charon, creating the visually striking red spot at the satellite's north pole.