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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

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 Spacecraft Closes In On Pluto

Unmanned probe's closest encounter with dwarf planet expected Tuesday

Pluto-Palooza

Find out why the dwarf planet Pluto casts a historical shadow over the Lowell Observatory in Flagstaff, where NASA's July 14th Pluto flyby is big news.

Arizona Spotlight for July 3rd, 2015

Exploring the planet Pluto as never before; land and sea survival training tests Air Force pilots' mettle; monsoon love for toads, tarantulas, and tortoises; and A Book I Love.