Our first good look at Pluto is no-brainer at No. 1.
The debris, catalogued as WT1190F, is not the only space visitor being watched this week.
This lunar eclipse begins conveniently at sunset
NASA mission incorporates music, comedy, art and acrobatics in public outreach.
Tim Hunter's guide to the supermoon.
Dickinson's expertise ranged from plate tectonics to archaeology.
Scorpius the Scorpion rises this week with the bright red star Antares at its heart.
Venus is our current “evening star.”
UA biologist to talk about interactions that lead to complex organisms.
Asteroids and comets may have provided the spark but life needs a planet or moon to evolve.
Brother Guy says he won't answer the question 'What is Life?' in his opening lecture.
This image of Jupiter shows a moon shadow on the giant planet's Great Red Spot.
Even though it has been hot and has felt like summer for weeks, it officially begins this Saturday at 3:51 a.m.
Temperatures in the Southwest are rising faster compared to those of the U.S. as a whole, a new White House report ion climate shows.
Tucson is the epicenter of a meteorite hunt after a shower of space rocks landed north of the city Tuesday night.
The Forest Service laid much of the groundwork Friday for approval of the Rosemont Mine by releasing a final environmental report saying essentially that while the mine will cause negative impacts, it’s now clearly in line with nearly all environmental laws.
Earlier this year, scientists at the NOAA Mauna Loa Observatory in Hawaii announced a major threshold in the Earth system had been crossed: the concentration of the greenhouse gas carbon dioxide in Earth’s atmosphere has now passed a level not seen in the last 3 million years.
Much of the heat that was supposed to fire up the globe’s air in the past 15 years — but didn’t — has gone into the ocean, a University of Arizona oceanographer said Friday.
Despite years of growing concern about drought, some good water news has emerged: The Tucson area has balanced its water pumping with recharge more than a decade ahead of schedule.
Davidson Canyon and Cienega Creek — linchpin issues for many who oppose the Rosemont Mine — aren’t in as big a danger from mine impacts as many people think, the U.S. Forest Service says.