Eyes on Asteroids - NASA/JPL - NASA's Eyes
Explore the 3D world of Asteroids, Comets and NEOs. Learn about past and future missions, tracking and predicting orbits, and close approaches to Earth.
Asteroids - NASA Science
Asteroids, sometimes called minor planets, are rocky, airless remnants left over from the early formation of our solar system about 4.6 billion years ago. Most asteroids can be found orbiting the Sun between Mars and Jupiter within the main asteroid belt.
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 (metallic), or S-type (silicaceous).
What Is an Asteroid? | NASA Space Place – NASA Science for Kids
2024年10月11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 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.
NASA’s Planetary Radar Tracks Two Large Asteroid Close …
2024年7月3日 — These seven radar observations by the Deep Space Network’s Goldstone Solar System Radar shows the mile-wide asteroid 2011 UL21 during its June 27 close approach with Earth from about 4 million miles away. The asteroid and its small moon (a bright dot at the bottom of the image) are circled in white.
Asteroids, Comets & Meteors - NASA Science
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 | Definition, Size, & Facts | Britannica
2024年10月7日 — 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.
What are Asteroids? - Universe Today
2015年9月9日 — Asteroids are rocky, metallic bodies that orbit the Sun. They are made from different kinds of rock and metals, with the metals being mostly nickel and iron. They are sometimes called “minor ...
Fast Facts | NASA Jet Propulsion Laboratory (JPL)
Asteroid Watch: Fast Facts. What are the differences between an asteroid, comet, meteoroid, meteor, and meteorite? Asteroid. A relatively small, inactive body orbiting the Sun. Asteroids are typically composed of rocky, dusty, and metallic materials.
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