New data reveals a 3-million-light-year filament connecting two galaxies, each of which hosts a supermassive black hole.

It's a key problem that will need to be addressed if humans are to attempt deep-space, long-duration missions. Not only is radiation exposure a dangerous health risk to humans, but it also poses a ...

An electrospray engine applies an electric field to a conductive liquid, generating a high-speed jet of tiny droplets that ...