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A planetary mass the size of Mars could be warping the orbits of some smaller objects beyond Neptune.

Scientists See Clues of Possible Unseen Planet in Solar System

Disruption in the orbits of objects in the distant Kuiper Belt suggest a large body.

There are plenty of activities for kids at the UA Lunar and Planetary Lab's summer open house.

UA Lunar and Planetary Lab to Celebrate Years of Mars Photos

Annual open house will feature the work of HiRISE camera as well as activities for kids, adults.

UA Space Programs to Launch 'Asteroid Day' 2017 Stream

OSIRIS-REx, Catalina Sky Survey lead off programming.

A map of the path of the total solar eclipse occurring Aug. 21, 2017.

Tucson Astronomer to Lead Citizen Observations During Eclipse

Arizona to see partial blockage Aug. 21

Space artists retired astronaut Nicole Stott and planetary scientist William Hartmann of Tucson meet at Spacefest VIII.

Astronauts and Aficionados Enter Tucson's Orbit for Spacefest

Experts and fans rub shoulders during space-themed weekend.

Henry Throop shows students how to use a telescope to observe sunspots during the day, at Dendron Secondary school in rural Limpopo, South Africa.

Planetary Scientist Honored for Global Outreach

Henry Throop to receive Carl Sagan Medal from astronomical society.

Planetary scientist Tom Zega with the UA Lunar and Planetary Laboratory's transmission electronic microscope which will analyze dirt samples returned from the asteroid Bennu in 2023. The instrument has serial number 1.

UA to Get Early Sample of Asteroid for Study

The material should give a glimpse into the history of Bennu, and of the universe.

Jupiter’s south pole, as seen by NASA’s Juno spacecraft from an altitude of 32,000 miles. The oval features are cyclones.

Tucson Camera on Jupiter Mission Reveals Cyclones

Tucson's Planetary Science Institute scientist manages Juno Cam for NASA.

Trump Budget Eliminates NASA Space Grant, Education Programs

Arizona Space Grant Consortium trains students for STEM careers

The dome of a telescope at the UA Sky Center campus on Mount Lemmon.

Mount Lemmon SkyCenter Open House Saturday

Telescopes, exhibits and family activities show off science of the mountain.

An alluvial fan is a fan-shaped deposit of sediments dropped by streams where the topography flattens and the water can spread over a broad area, typically at the exit of a canyon.

'Mars is Beautiful,' UA Scientists Enthuse Over Book of HiRISE Images

Also on Arizona Spotlight: Finding a future for historic Tucson places to become community art spaces; tune in with the UA amateur radio club; and new music from the Weiss / Soflin duo.

Retired Marine General Charles Bolden at the Goddard Space Flight Center in 2010, when he was administrator of NASA.

Former NASA Administrator Sees Key Role for UA in Space

OSIRIS-REx mission to asteroid is unprecedented.

As much as 22 percent of Shackleton Crater’s surface could contain ice, according to data from NASA's Lunar Reconnaissance Orbiter. The crater is located at the lunar south pole.

Shadow-Piercing Camera from ASU to Study Moon

The ShadowCam will look at 'dark side of moon' to help plan future missions.

Retired Oro Valley astronaut Charlie Walker says human exploration of space should continue.

Human Minds, Hands Critical in Space Missions, Ex-Astronaut Says

Space Shuttle alumnus Charlie Walker inspired by early satellites.

Asteroid 2014 JO25 will pass close to Earth April 19.

Fast and Bright Asteroid to Near Earth Next Week

The Tucson-discovered space rock will be studied by astronomers all over the world for its properties.

An HD animation of Jupiter created with maps made with Hubble imagery, 2015.

Jupiter to Shine Its Brightest and Biggest

Largest planet making closest approach to Earth this year Friday.

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