What is a Planet? | Planets – NASA Solar System Exploration
A planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.
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.
NASA Planetary Science Highlights: 2021
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.
10 Things to Expect in Planetary Science for 2021
2021年1月28日 · Here are some of the things to watch for in planetary science, as we continue to explore and learn about our incredible solar system. Deep Space Station 43 officially opened in 1973. It remains the largest steerable parabolic antenna in the Southern Hemisphere.
Planet Compare - NASA Solar System Exploration
2024年10月24日 · Planet Compare. NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.
About Us – NASA Solar System Exploration
2024年10月24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 | Earth – NASA Solar System Exploration
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.
RPS 3D Viewer - NASA Solar System Exploration
2024年10月24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 | Mars – NASA Solar System Exploration
Mars is one of the easiest planets to spot in the night sky – it looks like a bright red point of light. Despite being inhospitable to humans, robotic explorers – like NASA's new Perseverance rover – are serving as pathfinders to eventually get humans to the surface of the Red Planet.
Saturn | Science – NASA Solar System Exploration
2024年10月24日 · Saturn may be known for its rings, but the planet itself offers irresistible and inexhaustible subjects for study. With more than 700 times the volume of Earth, Saturn is a behemoth.