In Depth | Our Solar System – NASA Solar System Exploration
网页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.
What is a Planet? | Planets – NASA Solar System Exploration
网页Defining the term planet is important, because such definitions reflect our understanding of the origins, architecture, and evolution of our solar system. Over historical time, objects categorized as planets have changed.
10 Things to Expect in Planetary Science for 2021 - NASA Solar …
网页2021年1月28日 · New missions and new milestones are on the calendar for 2021. Here are some of the things to watch for in planetary science, as we continue to explore and learn about our incredible solar system.
NASA Planetary Science Highlights: 2021 - NASA Solar System …
网页2021年12月23日 · Our 2021 round-up of NASA planetary science is packed with the year’s most spectacular images, ground-breaking discoveries, and incredible mission events.
In Depth | Earth – NASA Solar System Exploration
网页While Earth is only the fifth largest planet in the solar system, it is the only world in our solar system with liquid water on the surface. Just slightly larger than nearby Venus, Earth is the biggest of the four planets closest to the Sun, all of which are made of rock and metal.
In Depth | Sun – NASA Solar System Exploration
网页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.
In Depth | Neptune – NASA Solar System Exploration
网页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 only planet in our solar system not visible to the naked eye.
In Depth | Mars – NASA Solar System Exploration
网页The fourth planet from the Sun, Mars is one of Earth's two closest planetary neighbors (Venus is the other). Mars is one of the easiest planets to spot in the night sky – it looks like a bright red point of light.
About Us - NASA Solar System Exploration
网页2024年10月1日 · We provide the public with reliable, accurate, up-to-date information about the planets, moons, asteroids, comets and everything else in our solar system. We also provide a complete historical record of deep space exploration.
In Depth | Venus – NASA Solar System Exploration
网页It's a cloud-swaddled planet named for a love goddess, often called Earth’s twin. But pull up a bit closer, and Venus turns hellish. Our nearest planetary neighbor, the second planet from the Sun, has a surface hot enough to melt lead.