NASA's OSIRIS-REx mission is scheduled to return samples of Asteroid Bennu to Earth. Credit: NASA Goddard Space Flight Center ...

Tucson’s skies are slightly darker thanks to the completed streetlight conversion project, according to a study by the Tucson-based International Dark-Sky Association.

For Star subscribers: Tucson's Planetary Science Institute at 50: From four young researchers to a worldwide team of more than 100 scientists that's one of the largest firms of its ...