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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

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.

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.

Coming in July: Dwarf Planet Pluto, Up Close and Personal

Flagstaff eagerly awaits distant dwarf planet coming into sight of long-traveling space probe.

Tucson Technology to Photograph Jupiter's Moon

University of Arizona researchers' instruments win ride aboard journey to Europa

Arizona Spotlight for May 1st, 2015

"Now en Español" tells how five Latina actresses became "Desperate Housewives" in Spanish; MacArthur Fellow Olivier Guyon searches the stars for distant planets; "I Dream in Widescreen" showcases student films; San Ysidro Festival revives old traditions.

UA Optical Scientist Explores Universe For Exoplanets

MacArthur Fellow Olivier Guyon is leading the search for Earth-like worlds outside our solar system.

Hubble Space Telescope Marks 25 Years in Space

University of Arizona scientists mark historic launch of groundbreaking telescope

A computer-generated image of LSST's location on Cerro Pachón in Chile. (Image by Todd Mason, Mason Productions Inc./LSST Corporation)

Unique Telescope Destined for South America Started at UA

Mirrors inside Large Synoptic Survey Telescope being assembled in Chile were built in Tucson.

The San Pedro River flows through Sierra Vista.

Study Tracks Light Pollution in San Pedro River Valley

Researchers to examine effects of artificial light on on animal migration patterns

L-o-o-o-ng Distance Conversation Between Astronaut Twins

Mark Kelly, in Tucson, speaks with Scott Kelly, aboard International Space Station.

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[Astronomy]