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2. In Depth | Uranus – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/uranus/in-depth.amp

   Uranus is the only planet whose equator is nearly at a right angle to its orbit, with a tilt of 97.77 degrees – possibly the result of a collision with an Earth-sized object long ago. This unique tilt causes the most extreme seasons in the solar system.

3. 10 Need-to-Know Things About Uranus - NASA Solar System...

   solarsystem.nasa.gov/module/93

   Uranus is an ice giant. Most of its mass is a hot, dense fluid of "icy" materials – water, methane and ammonia – above a small rocky core.

4. Uranus - NASA Solar System Exploration

   solarsystem.nasa.gov/module/82

   Distance from Sun. mikm. NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.

5. Uranus By the Numbers – NASA Solar System Exploration

   solarsystem.nasa.gov/uranus-by-the-numbers

   Uranus is the seventh planet from the Sun, and the third largest planet in our solar system. It appears to spin sideways.

6. In Depth | Uranus Moons – NASA Solar System Exploration

   solarsystem.nasa.gov/moons/uranus-moons/in-depth.amp

   All of Uranus's inner moons (those observed by Voyager 2) appear to be roughly half water ice and half rock. The composition of the moons outside the orbit of Oberon remains unknown, but they are likely captured asteroids.

7. Planet Compare – NASA Solar System Exploration

   solarsystem.nasa.gov/planet-compare

   Planet Compare. NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.

8. In Depth | Our Solar System – NASA Solar System Exploration

   solarsystem.nasa.gov/solar-system/our-solar-system/in-depth.amp

   Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids.

9. In Depth | Neptune – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/neptune/in-depth.amp

   Neptune took shape when the rest of the solar system formed about 4.5 billion years ago when gravity pulled swirling gas and dust in to become this ice giant. Like its neighbor Uranus, Neptune likely formed closer to the Sun and moved to the outer solar system about 4 billion years ago.

10. In Depth | Moons – NASA Solar System Exploration

    solarsystem.nasa.gov/moons/in-depth.amp

    In the outer solar system, the gas giants Jupiter and Saturn and the ice giants Uranus and Neptune have dozens of moons. As these planets grew in the early solar system, they were able to capture smaller objects with their large gravitational fields.

11. Gravity Assist: Ice Giants (Uranus & Neptune) with Amy Simon

    solarsystem.nasa.gov/news/303/gravity-assist-ice-giants-uranus-neptune-with...

    Beyond Saturn are two of the most misunderstood and bizarre planets in our solar system—the “ice giants” Uranus and Neptune. Did you know that Uranus has rings and appears to spin on its side? And that windy and intensely blue Neptune once had an Earth-sized Great Dark Spot?