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A time lapse photograph of light pollution from Tucson reaching the Picacho Peak night sky.

Bill Would Loosen Restrictions on Electronic Billboards

Astronomers worried that it will lead to incremental loss of dark skies.

This image of the dwarf planet was captured from New Horizons on July 13, 2015, about 16 hours before the moment of closest approach. The spacecraft was 766,000 kilometers from the surface.

Researcher: Part of Pluto Younger Than Thought

Photos show one region with smooth surface, indicating it is less than 10 million years old.

This image was composed from a series of images taken Oct. 12, 2015, when Lunar Reconnaissance Orbiter was about 83 miles (134 kilometers) above the moon's far side crater Compton.

Christmas Full Moon: Bright Ornament in the Sky

First holiday occurrence in 38 years; we won't have another for 19 years.

False-color image of a 2011 Geminid meteor, seen by a camera at New Mexico State University.

Geminid Meteor Shower to Light Up Sky This Weekend

120 visible each hour; best viewing Sunday night into Monday morning.

Comet C/2013 US10 Catalina shows off a compact green coma and two tails in this photo taken Nov. 22, 2015, at dawn from Arizona. The green color comes from carbon compounds fluorescing in UV sunlight. Photo by Chris Schur

Astronomer Shares 'Science Snacks' With Podcasts

Comet recording exceeded 100,000 downloads

Beyond Our Solar System, Too Many Worlds To Name

Tucson-based scientist looks back on 20 years of interplanetary discoveries.

New Horizons captured this image of Pluto's glacial ice cap in July 2015.

'Mind-Boggling:' Pluto Fly-By Reveals Slushy Glaciers

New Horizons spacecraft took pictures in July; analysis under way in Flagstaff.

Small Crater on Arcuate Ridge West of Olympia Mensae

AZ WEEK: Exploring Mars on Silver Screen, in UA Research

University of Arizona's connection to planetary science dates to dawn of Space Age.

Dark streaks are evidence of water flowing on surface of Mars, UA and other scientists say.

'Strongest Evidence' Mars Has Water, UA Scientist, Others Say

UA's HiRISE imaging equipment captured information leading to conclusion.

Rare 'Blood Super Moon' Coming in Lunar Eclipse

Many lunar coincidences contribute to what astronomers say will be stunning night sky Sunday.

Tucson Residents Focus on the Moon, Celebrate Science

Groups encourage residents to "look up and be inspired."

What Happened To Mars' Atmosphere? Mystery Deepens

Flagastaff scientist delves into it, comes up with controvertible argument about red planet.

Gerard Kuiper (second from left) with NASA engineers 1964

UA Astronomy Pioneer Kuiper's Work Still Relevant Today

He advanced US space exploration in the 1960s, including moon crash landing.

UA’s completed camera suite, OCAMS, sits on a test bench that mimics its arrangement on the OSIRIS-REx spacecraft. The three cameras that compose the instrument are the eyes of NASA’s OSIRIS-REx mission. They will map the asteroid Bennu, help choose a sample site, and ensure that the sample is correctly stowed on the spacecraft.

UA-Built Cameras Ready for OSIRIS-REx Spacecraft

Three-camera suite will aid in mission's goal of asteroid soil sample.

Meteors radiate from Constellation Perseus in northeast sky

Perseid Meteor Shower Peaks This Week

Best viewing after midnight

This artist's concept depicts one possible appearance of the planet Kepler-452b, the first near-Earth-size world to be found in the habitable zone of star that is similar to our sun. The habitable zone is a region around a star where temperatures are right for water -- an essential ingredient for life as we know it -- to pool on the surface. Scientists do not know if Kepler-452b can support life or not. What is known about the planet is that it is about 60 percent larger than Earth, placing it in a class of planets dubbed "super-Earths."

Whipple Observatory Supplied Data for Planet Discovery

First near-earth-size planet in habitable zone

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