RPS 3D Viewer - NASA Solar System Exploration
2024年11月20日 · 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 | 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; dozens of moons; and millions of asteroids, comets, and meteoroids.
In Depth | Sun – NASA Solar System Exploration
The Sun is the largest object in our solar system. Its diameter is about 865,000 miles (1.4 million kilometers). Its gravity holds the solar system together, keeping everything from the biggest planets to the smallest bits of debris in orbit around it.
Titan | Science – NASA Solar System Exploration
2024年10月24日 · NASA's Cassini spacecraft would eventually complete more than 100 targeted flybys of Titan, sending European Space Agency’s Huygens probe to land on the mysterious, alien world—the first landing on a surface in the outer solar system.
What is a Planet? | Planets – NASA Solar System Exploration
Some astronomers argued that location (context) is important, especially in understanding the formation and evolution of the solar system. One idea is to simply define a planet as a natural object in space that is massive enough for gravity to make it approximately spherical.
In Depth | Earth's Moon – NASA Solar System Exploration
The craters themselves, which have been preserved for billions of years, provide an impact history for the Moon and other bodies in the inner solar system. If you looked in the right places on the Moon, you would find pieces of equipment, American flags, and even a …
Saturn | Science – NASA Solar System Exploration
2024年11月20日 · How Cassini Changed Our View of ... Saturn. Overview: Before Cassini, scientists viewed Saturn’s unique features only from Earth and from a few spacecraft flybys. But over more than a decade orbiting the gas giant, Cassini studied the composition and temperature of Saturn’s upper atmosphere as the seasons changed there.
In Depth | Saturn – NASA Solar System Exploration
Saturn is the sixth planet from the Sun and the second-largest planet in our solar system. Like fellow gas giant Jupiter, Saturn is a massive ball made mostly of hydrogen and helium. Saturn is not the only planet to have rings, but none are as spectacular or as complex as Saturn's.
Rings | Science – NASA Solar System Exploration
No other planet in our solar system has rings as splendid as Saturn’s. They are so expansive and bright that they were discovered as soon as humans began pointing telescopes at the night sky. Galileo Galilei was the first person known to view the heavens through a telescope.
In Depth | Moons - NASA Solar System Exploration
There are hundreds of moons in our solar system – even asteroids have been found to have small companion moons. Of the terrestrial (rocky) planets of the inner solar system, neither Mercury nor Venus have any moons at all, Earth has one and Mars has its two small moons.