Nuclear power plants are safer than many suspect. But putting reactors in space is a concept with a checkered history. One ...

Neptune's far-flung moon Nereid may be the last of the planet's original companions that managed to survive a cosmic crash, ...

The billionaire, who wants to ensure humans don't have 'the same fate as dinosaurs', sees a future that includes space ...

Scientists have found a cheaper way to send spacecraft to the Moon by using a gravitational sweet spot as a pit stop, cutting fuel costs by at least 58.80 m/s compared to existing methods.

An international team of researchers say they've found a more efficient route from Earth to the moon using advanced computer ...

This goes against the previous theory, which has long suggested that Nereid is actually an object captured from the Kuiper ...

How can it be that the Moon's mass is a little over 1 percent of Earth's mass, while its gravity is about 17 percent of Earth ...

Neptune’s third-largest moon, Nereid, could be an intact survivor from the planet’s original satellite system, upending ...

Elon Musk's rocket company didn't hold back on its nerdiness when revealing its finances to Wall Street. We explain what the ...

Neptune’s moons have long provided evidence of a cataclysm four billion years ago. A new study suggests one moon may have ...

The final mission before the landmark Apollo 11, Apollo 10 served as a dress rehearsal, testing every aspect of the Moon landing except for the actual landing itself. On May 18, the crew of Commander ...