Planet Compare – NASA Solar System Exploration
Oct 21, 2025 · NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.
In Depth | Oberon – NASA Solar System Exploration
Oberon is heavily cratered―similar to Umbriel―especially when compared to three other moons of Uranus: Ariel, Titania and Miranda. Like all of Uranus' large moons, Oberon is composed of roughly …
In Depth | Our Solar System – NASA Solar System Exploration
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; …
In Depth | Uranus Moons – NASA Solar System Exploration
Cordelia and Ophelia are shepherd moons that keep Uranus' thin, outermost "epsilon" ring well defined. Between them and Miranda is a swarm of eight small satellites unlike any other system of planetary …
In Depth | Enceladus – NASA Solar System Exploration
Oct 9, 2008 · Because Enceladus reflects so much sunlight, the surface temperature is extremely cold, about minus 330 degrees Fahrenheit (minus 201 degrees Celsius). But it is not as cold and inactive …
In Depth | Triton – NASA Solar System Exploration
NASA's Voyager 2―the only spacecraft to fly past Neptune and Triton―found surface temperatures of -391degrees Fahrenheit (-235 degrees Celsius). During its 1989 flyby, Voyager 2 also found Triton …
In Depth | Sun – NASA Solar System Exploration
It's about 250 miles thick, with temperatures reaching about 10,000 degrees Fahrenheit (5,500 degrees Celsius). That's much cooler than the blazing core, but it's still hot enough to make carbon – like …
Pluto By the Numbers - NASA Solar System Exploration
Oct 21, 2025 · Pluto was once our solar system's ninth planet, but has been reclassified as a dwarf planet. It's located in the Kuiper Belt.
In Depth | Kuiper Belt – NASA Solar System Exploration
The amount of material in the Kuiper Belt today might be just a small fraction of what was originally there. According to one well-supported theory, the shifting orbits of the four giant planets (Jupiter, …
In Depth | Earth's Moon – NASA Solar System Exploration
The temperature on the Moon reaches about 260 degrees Fahrenheit (127 degrees Celsius) when in full Sun, but in darkness, the temperatures plummet to about -280 degrees Fahrenheit (-173 degrees …