The most recent volcanic activity on Mars, which occurred about 50,000 years ago, might have been triggered by a nearby asteroid impact that happened around the same time. 

UArizona researchers have observed, in unprecedented detail, organic molecules in planetary nebulae. Their work sheds new light on how stars form and die.

Fixing just the worst leaks in the Permian Basin oil field could cut emissions of methane  — a potent greenhouse gas — by 55 tons an hour, new research finds.

The university's COVID-19 vaccination POD has moved fully indoors and will continue to operate through June 25. Walk-ins are accepted at the Ina E. Gittings Building.

University of Arizona Health Sciences experts say resilience helped many older adults overcome a "second pandemic" of social isolation.

A College of Medicine – Tucson assistant professor of pediatrics answers questions about COVID-19 vaccine effectiveness and the risk of side effects in children.

Western butterfly populations are declining at an estimated rate of 1.6% per year, according to a new report in Science. The western monarch population has declined 99.9% since the 1980s.

The AZ HEROES study is tracking viral immunity over time and assessing vaccine effectiveness in essential workers and college students. The data will help inform decision making as we continue to confront the pandemic, says Dr. Jeff Burgess.

A series of smaller in-person Commencement ceremonies are planned over a weeklong period in May, President Robert C. Robbins announced this week.

A new study dates emergence of the virus that causes COVID-19 to as early as October 2019. Simulations also suggest that in most cases zoonotic viruses die out naturally before causing a pandemic.