This is a movie rendered in three dimensions of a supercomputer simulation of a powerful relativistic jet interacting with dense clouds surrounding an active galactic nucleus.

In this video, Charles Bolden discusses the important role that NASA plays in shaping the future of space exploration, and the agency's long-term ambitions, such as landing astronauts on Mars.

Evidence has been accumulating for several decades that many galaxies harbor central mass concentrations that may be in the form of black holes with masses between a few million to a few billion time the mass of the Sun.