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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.

Alfred McEwen, Principal Investigator for HiRISE, speaks about the High Resolution Imaging Science Experiment.

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-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

Ken Conway matches a star field map to the view seen through his telescope and recorded on a laptop.

Amateur Astronomers Help Map Kuiper Belt

Band of frozen objects includes the dwarf planet Pluto

Scientists Celebrate First Close Up Pictures of Pluto

UA researcher among mission controllers viewing New Horizons images

New Horizons Arrives At Target Pluto

Scientists look for new discoveries about dwarf planet, Artists seek "human connection" to Pluto

New Horizons Spacecraft Closes In On Pluto

Unmanned probe's closest encounter with dwarf planet expected Tuesday

Mirror blank construction at the University of Arizona Richard F. Caris Mirror Lab

UA Making Biggest Mirrors for World's Biggest Telescope

Earthbound Giant Magellan Telescope will see 10 times better than Hubble.

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