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Asteroid 2016 RB1 flew past Earth on Sept. 7, 2016 going an estimated 18,000 mph.

UA Astronomer Sees Asteroid 2 Days Before It Whizzes by Earth

NASA-funded Sky Lab's observers have ID'd half of known near-Earth objects.

Does 'Planet Nine' Exist? NAU Astronomer Says Maybe

Three objects discovered at edge of solar system may lead to planet's existence.

Kuiper Space Sciences Building at the University of Arizona.

Asteroid Mission Focus of UA Planetary Science Open House

Next door, the Flandrau Science Center will unveil its renovated planetarium theater.

UA Scientists to Make 3-D Map of Universe for Dark Energy Clues

Kitt Peak instrument will measure light of 35 million objects over 5 years.

NASA's Juno mission to Jupiter will examine the origin and evolution of the solar system's largest planet.

Tucson Planetary Researcher Awaits Far Out Photo Op

Camera aboard spacecraft Juno, now orbiting Jupiter, soon wll deliver images.

Perseids Meteor shower

Two Meteor Showers Will Dazzle in Arizona's August Sky

Overlapping showers mean lots of visible shooting stars.

UA Student Discovers Distant Planet in Three-Star System

Four times Jupiter's mass, celestial body can offer clues to planetary formation.

UA planetary scientist Erich Karkoschka's images of Jupiter and Uranus are featured on US postage stamps issued May 31, 2016.

UA Planetary Images Get (Postage) Stamp of Approval

Scientist’s work will now grace U.S. mail

Completed in 1962, the National Solar Observatory's McMath-Pierce Solar Telescope at Kitt Peak, Arizona, is the world's largest solar telescope.

Era of Solar Discovery on Kitt Peak Coming to an End

Larger telescope on Maui will continue research

Adam Block, manager of the UA-operated Mount Lemmon Sky Center, talks about the PanStarrs Comet which he was able to photograph.

Tucson Amateur Astronomers Host Free Star Party

Saturday is international Astronomy Day

Students at Cienega High School in Vail use telescopes to observe Mercury passing between the Sun and Earth during the May 9, 2016, transit event.

Vail's Cienega High Students to Document 2017 Solar Eclipse

Monday's Mercury transit provides telescope and data collection training.

William Hartmann photographs an image of the Moon projected on a three-foot hemisphere in the UA Lunar and Planetary Lab's first premises, a Quonset hut.

Book Chronicles History of Planetary Science in Tucson

'Under Desert Skies' details pivotal role played by UA scientists

UA Astrophysicist Named Guggenheim Fellow

Feryal Ozel will study neutron stars, black holes

NASA launches a ship in to space.

Planetary Science Institute to Train Teachers on NASA Data

$2.6 million NASA grant will encourage student discoveries

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.

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