Likelihood Low of Asteroid Colliding With Earth

Do asteroids deserve their nasty reputation? On the occasion of Asteroid Day, Eric Christensen, director of the UA's Catalina Sky Survey, talks about the odds and consequences of an asteroid wreaking havoc on Earth.

When Plants Become Space Invaders

Declines in native biodiversity can open opportunities for imported species to not only grab a foothold in a new territory, but also to evolve into invasive pests.

Construction to Begin on World's Largest Telescope

Collaborators secure more than $500 million to build seven mirrors for Giant Magellan Telescope at UA's Richard F. Caris Mirror Lab.

New Insights Into Drivers of Earth's Ecosystems

A UA-led international team has uncovered new information about the ways marine viruses and microbes interact on a global scale.

Remembering Rafe: From Tide Pools to the Stars

With the tragic death of Raphael "Rafe" Sagarin, the UA community has lost someone whose boundless enthusiasm, sharp intellect and caring attitude inspired others.

Walter Piegorsch: UA's Wizard of Odds Does the Math

From cancer research to disaster relief, from engineering bridges to playing a poker hand, virtually every conceivable process is a game of odds.

Sea Level Spiked for Two Years Along NE North America

A four-inch increase in sea levels from New York to Newfoundland occurred in 2009 and 2010 because ocean circulation changed, reports a UA-led team.

Eggs With Attitude: The Behavior of Bluebirds

Bluebird mothers are uniquely positioned to be a bridge between current environmental conditions and the traits of their offspring.

Monster Black Hole Discovered at Cosmic Dawn

Researchers report the discovery of the brightest quasar in the early universe, powered by the most massive black hole yet known at that time.

Plunging Into Saturn's Moon

To highlight the 10th anniversary of the Huygens landing, the European Space Agency (ESA) published a movie showing the landing in more detail than ever.


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