A rocket really just needs two things: mass to eject and something to push that mass out. In a conventional rocket, a fuel does both of these things. The fuel is ignited, providing energy, and then it ...

Elon Musk's private rocket company SpaceX announced Monday that it plans to launch two paying customers around the moon in late 2018. How hard will that be to accomplish, exactly? Gravity makes it ...

Laura Aydelotte, a scholar of rare books, creates striking animations from sketches and artwork appearing in medieval manuscripts. And each one has a unique story to tell. The Dance of Death The Danse ...