Planet Compare - NASA Solar System Exploration
2024年12月19日 · Explore NASA's real-time science encyclopedia and compare the sizes of planets in 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 …
What is a Planet? | Planets – NASA Solar System Exploration
Everyone knows that Earth, Mars and Jupiter are planets. But both Pluto and Ceres were once considered planets until new discoveries triggered scientific debate about how to best describe …
In Depth | Moons – NASA Solar System Exploration
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. In the outer solar system, the …
In Depth | Earth – NASA Solar System Exploration
Our home planet is the third planet from the Sun, and the only place we know of so far that’s inhabited by living things. While Earth is only the fifth largest planet in the solar system, it is …
Gravity Assist: Ice Giants (Uranus & Neptune) with Amy Simon
2018年1月17日 · They're very different planets than the other ones we think of. And part of the reason we call them ice giants is because they actually have a lot of water ice. So, while some …
The Solar System and Beyond is Awash in Water
2015年4月6日 · Earth isn't the only ocean world in our solar system. Oceans could exist in diverse forms on moons and dwarf planets, offering clues in the quest to discover life beyond our …
Rise and Shine with the Planets - NASA Solar System Exploration
2006年8月15日 · The planets Venus, Mercury and Saturn dance on the ecliptic -- the plane of Earth's orbit and the imaginary line tracing it in the sky. The sun, moon and planets appear to …
In Depth | Sun – NASA Solar System Exploration
The Sun orbits the center of the Milky Way, bringing with it the planets, asteroids, comets, and other objects in our solar system. Our solar system is moving with an average velocity of …
In Depth | Neptune – NASA Solar System Exploration
Dark, cold, and whipped by supersonic winds, ice giant Neptune is the eighth and most distant planet in our solar system. More than 30 times as far from the Sun as Earth, Neptune is the …