Asteroid - Wikipedia
An asteroid is a minor planet —an object that is neither a true planet nor an identified comet — that orbits within the inner Solar System. They are rocky, metallic, or icy bodies with no …
Asteroid | Definition, Size, & Facts | Britannica
5 天之前 · Asteroid, any of a host of small bodies, about 1,000 km (600 miles) or less in diameter, that orbit the Sun primarily between the orbits of Mars and Jupiter in a nearly flat ring called …
Asteroid Facts - Science@NASA
2024年11月3日 · Introduction. Most asteroids can be found orbiting our Sun between Mars and Jupiter within the main asteroid belt. Asteroids range in size from Vesta – the largest asteroid …
Eyes on Asteroids - NASA/JPL
Explore the 3D world of Asteroids, Comets and NEOs. Learn about past and future missions, tracking and predicting orbits, and close approaches to Earth.
Study Finds Earth’s Small Asteroid Visitor Likely Chunk of Moon …
3 天之前 · Asteroid Lunar Studies. The discovery of 2024 PT5 doubles the number of known asteroids thought to originate from the Moon. Asteroid 469219 Kamo’oalewa was found in …
Asteroid Fast Facts - NASA
2014年3月31日 · About once a year, an automobile-sized asteroid hits Earth’s atmosphere, creates an impressive fireball, and burns up before reaching the surface. Every 2,000 years or …
What Is an Asteroid? | NASA Space Place – NASA Science for Kids
2025年1月14日 · Asteroids are small, rocky objects that orbit the sun. Although asteroids orbit the sun like planets, they are much smaller than planets. A close-up image of the asteroid Ida …
In Depth | Asteroids - NASA Solar System Exploration
Asteroids, sometimes called minor planets, are rocky remnants left over from the early formation of our solar system about 4.6 billion years ago. The current known asteroid count is: . Most of …
What are asteroids? | Space
2023年7月28日 · Asteroids are the rocky remnants of material leftover from the formation of the solar system and its planets approximately 4.6 billion years ago. The majority of asteroids …
Physical characteristics and composition of asteroids | Britannica
asteroid, Any of the many rocky small bodies that orbit the Sun mainly in a flat ring, the asteroid belt, between the orbits of Mars and Jupiter.