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.
Earth: You forgot Earth Day! Again!
PASADENA, Calif. — In a show of technological wizardry, the robotic explorer Curiosity blazed through the pink skies of Mars, steering itself to a gentle landing inside a giant crater for the most ambitious dig yet into the red planet's past.
UA Earth Day 2012 is today, starting at 4 p.m. at Main Gate Square, 814 e. University Blvd.
WASHINGTON — An impressive solar flare is heading toward Earth and could disrupt power grids, satellite navigating systems and airplane flights.
Hardships were part of life for Southern Arizona pioneers in the
mid-1800s, but the trials endured by Larcena Pennington Page would
have brought the toughest frontiersman to his knees.
Tucson's Reach Concert isn't the only Christian rock festival
planned for Halloween Saturday.
The moon will be nearly full on Halloween and All Saints Day
this weekend, becoming officially full on Tuesday.