Io: A Volcanic Puzzle – NASA Solar System Exploration
1995年11月9日 · Some of this material escapes from Io's atmosphere and gets caught up in Jupiter's powerful magnetic field, forming a gigantic doughnut-shaped collection of particles orbiting around Jupiter known as the Io Plasma Torus.
10 Need-to-Know Things About Io - NASA Solar System Exploration
Io’s very thin atmosphere is primarily sulfur dioxide, which on Earth is sometimes used to preserve dried food.
In Depth | Titan – NASA Solar System Exploration
Learn about Saturn's largest moon, Titan, an icy world with a dense atmosphere and liquid methane on its surface. Find out how Titan compares to Earth and other moons in size, orbit, structure, formation, and surface features.
Scientists Solve the Mystery of Methane in Titan's Atmosphere
2006年2月28日 · Titan's atmosphere is rich in methane, which is locked in a methane-rich water ice that forms a crust above an ocean of liquid water mixed with ammonia. Scientists explain how three major episodes of outgassing pumped methane into Titan's mostly nitrogen atmosphere during its history.
In Depth | Triton – NASA Solar System Exploration
Triton is the largest and most unusual moon of Neptune, with a frozen nitrogen crust, a rocky core, and a thin atmosphere. It orbits in the opposite direction of Neptune's rotation and has active geysers and volcanoes.
In Depth | Jupiter – NASA Solar System Exploration
Jupiter is the largest planet in our solar system, with a radius of 43,440.7 miles (69,911 kilometers), 11 times wider than Earth. It orbits the Sun at an average distance of 484 million miles (778 million kilometers), taking 12 Earth years to complete one orbit.
Cassini Finds an Active, Watery World at Saturn's Enceladus
2005年7月28日 · The mass spectrometer found the water vapor comprises about 65 percent of the atmosphere, with molecular hydrogen at about 20 percent. The rest is mostly carbon dioxide and some combination of molecular nitrogen and carbon monoxide.
Cassini Finds an Atmosphere on Saturn's Moon Enceladus
2005年3月15日 · The Cassini spacecraft detected a significant atmosphere around Enceladus in 2005, possibly due to volcanism, geysers, or gases escaping from the surface or the interior. This is the first evidence of gases originating from Enceladus, a small and reflective moon with a geologically active surface.
In Depth | Europa – NASA Solar System Exploration
Learn about Europa, one of Jupiter's moons with a possible global ocean of liquid water beneath its icy surface. Find out how NASA explores Europa's potential for life and its surface features with spacecraft missions.
First Ultraviolet Imaging Spectrograph (UVIS) Spectral Images of ...
2000年10月19日 · This image sums 36 exposures of the Io torus in the emissions from sulfur and oxygen, taken over a 10-hour period beginning on 3 October. The hydrogen emissions from the Jupiter aurora form a central band to the right side. The brightest areas represent the strongest emissions of ionized sulfur and oxygen. One day in the life of Jupiter's Io torus,