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Scientists think a small rock discovered near Earth last August was hurled into space by an ancient impact on the lunar surface.

Grief can be hard on the body, says Mary-Frances O’Connor, a psychology professor at the University of Arizona and author of “The Grieving Body: How the Stress of Loss Can Be an Opportunity for Healing.”

The U of A ranks No. 1 in the U.S. and No. 4 in the world in water resources, according to ShanghaiRanking's 2024 Global Ranking of Academic Subjects.

Arizona Online ranks No. 12 among online bachelor's degree programs and ranks No. 5 on the Best Online Bachelor's Programs for Veterans list.

U of A astronomers have now produced the highest resolution direct images ever taken of a supermassive black hole in the infrared.

New observations led by a U of A astronomer suggest that even dwarf galaxies can accrete mass from other small galaxies, challenging a long-held theory about dwarf-galaxy expansion.

Regents’ Professor Marcia Rieke is the recipient of this year’s Russell Lectureship, which honors a full career of eminence is astronomical research.

The exoplanet mission, which will study of at least 20 known planets orbiting distant stars, has cleared an important milestone with the completion of its spacecraft bus.

Three newly discovered dwarf galaxies in an isolated region of space show evidence of star formation being cut short by events in the early universe.