Comet Lemmon and Comet SWAN will be closest to Earth as a new moon sets up prime viewing conditions. Add in a meteor shower and we may get spectacular sky gazing.

Tucson-area residents are installing rooftop-solar systems in hopes of saving money on their power bills while helping the environment. But some local homeowners have been stuck with high bills or ...

Dark matter is an enigmatic form of matter not expected to emit light, yet it is essential to understanding how the rich ...