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 atmosphere, classified as C-type (carbonaceous), M-type , or S-type (silicaceous).
Enormous, mountain-size asteroid will be visible from Earth this ...
2025年1月10日 · While an asteroid this big could trigger a mass extinction event if it were to collide with Earth, its large size also makes it a great target for curious stargazers. On Sunday (Jan. 12), Alinda ...
Asteroid | Definition, Size, & Facts | Britannica
4 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 the asteroid belt. Hundreds of thousands of asteroids are known.
Study Finds Earth’s Small Asteroid Visitor Likely Chunk of ... - NASA
1 天前 · 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 2016 with an Earth-like orbit around the Sun, indicating that it may also have been ejected from the lunar surface after a large impact. As telescopes become more sensitive to ...
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 this ancient space rubble can be found orbiting our Sun between Mars and …
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.
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 so, a meteoroid the size of a football field hits Earth and causes significant damage to the area.
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 taken by NASA's Galileo spacecraft. Image credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA. There are lots of asteroids in our solar system.
Asteroid and Comet Resources - Science@NASA
Learn about the NEOWISE mission, NASA's asteroid-hunting space telescope, which retired in summer 2024 after over a decade of discovering, tracking, and characterizing near-Earth objects (NEOs) — asteroids and comets that come close to Earth's orbit.
Asteroids, Comets & Meteors Facts - Science@NASA
Many comets, asteroids, and meteors haven't changed much in the 4.6 billion years since they first formed. Their relatively pristine state makes them wonderful storytellers with much to share about conditions in the early solar system.