What is a Planet?
Our Solar System
Meteors & Meteorites
Kuiper Belt & Oort Cloud
Beyond Our Solar System
Facts & Figures
Uranus' moon Ariel (white dot) and its shadow (black dot) were caught crossing the face of Uranus in this Hubble Space Telescope image.
10 Need-to-Know Things About Uranus:
If the sun were as tall as a typical front door, Earth would be the size of a nickel and Uranus would be about as big as a baseball.
Uranus: The Sideways Planet
Uranus orbits our sun, a star. Uranus is the seventh planet from the sun at a distance of about 2.9 billion km (1.8 billion miles) or 19.19 AU.
One day on Uranus takes about 17 hours (the time it takes for Uranus to rotate or spin once). Uranus makes a complete orbit around the sun (a year in Uranian time) in about 84 Earth years.
Uranus is an ice giant. Most (80 percent or more) of the planet's mass is made up of a hot dense fluid of "icy" materials – water (H
O), methane (CH
). and ammonia (NH
) – above a small rocky core.
Uranus has an atmosphere which is mostly made up of hydrogen (H
) and helium (He), with a small amount of methane (CH
Uranus has 27 moons. Uranus' moons are named after characters from the works of William Shakespeare and Alexander Pope.
Uranus has faint rings. The inner rings are narrow and dark and the outer rings are brightly colored.
is the only spacecraft to have visited Uranus.
Uranus cannot support life as we know it.
Like Venus, Uranus has a retrograde rotation (east to west). Unlike any of the other planets, Uranus rotates on its side, which means it spins horizontally.
Read More About Uranus
Just the Facts
Orbit Size (semi-major axis):
2.8706582 x 10
2.5362 x 10
6.83344 x 10
8.6810 x 10
Missions to Uranus
Images of Uranus
Videos about Uranus
Exploring the Planets - Uranus
NASA Planetary Photojournal - Uranus
National Space Science Data Center Photo Gallery - Uranus
StarDate - Uranus
Voyager: The Grandest Tour
Voyager 2 Science Summary for Uranus
Welcome to the Planets - Uranus
The Uranian Ring System
NASA's Planetary Photojournal - Uranian Rings
Power to Explore: Radioisotope Power
Compare Uranus to other Planets/Moons
"I really enjoy my involvement in space missions -- it is the best part of my job -- Voyager, Galileo, Deep Space 1, New Horizons and Juno."
Meet More Space Explorers
20 Aug 2012:
Voyager at 35: Break on Through to the Other Side
9 Aug 2011:
Power to Explore: 50 Years of Nuclear Space Power
21 Jan 2011:
Voyager Celebrates 25 Years Since Uranus Visit
25 Feb 2009:
The Curious Case of Missing Asteroids
14 Oct 2008:
New Images Yield Clues to Seasons of Uranus
Science & Technology Features
17 Oct 2013:
18 Apr 2013:
Solar System Exploration @ 50: What the Experts Picked
25 Feb 2013:
50 Years of Robotic Planetary Exploration: David Kring, Senior Staff Scientist, Universities Space Research Association, Houston; Principal Investigator, LPI-JSC
8 Feb 2013:
50 Years of Robotic Planetary Exploration: Julie Castillo-Rogez, Planetary Geophysicist at the Jet Propulsion Laboratory (JPL)
6 Feb 2013:
State of the Solar System
Awards and Recognition
Solar System Exploration Roadmap
Print This Page
NASA Official: Kristen Erickson
Advisory: Dr. James Green, Director of Planetary Science
Outreach Manager: Alice Wessen
Curator/Editor: Phil Davis
Science Writer: Autumn Burdick
Producer: Greg Baerg
Webmaster: David Martin
NASA Science Mission Directorate
Budgets, Strategic Plans and Accountability Reports
Equal Employment Opportunity Data
Posted Pursuant to the No Fear Act
Information-Dissemination Policies and Inventories
Freedom of Information Act
Inspector General Hotline
Office of the Inspector General
NASA Communications Policy
NASA Advisory Council
Open Government at NASA
Last Updated: 2 Apr 2014