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).
What Is an Asteroid? | NASA Space Place – NASA Science for Kids
2024年12月5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 Definition & Meaning - Merriam-Webster
The meaning of ASTEROID is any of the small rocky celestial bodies found especially between the orbits of Mars and Jupiter. How to use asteroid in a sentence.
Asteroid | Definition, Size, & Facts | Britannica
2024年11月25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.
Asteroid: Definition, Size, Difference, Visibility, Facts
2024年10月5日 · An asteroid is a small, rocky object that orbits the Sun, primarily found in the asteroid belt between Mars and Jupiter. Asteroids range in size from tiny pebbles to massive bodies hundreds of kilometers across, with the largest, Ceres, measuring approximately 946 kilometers (588 miles) in diameter.
ASTEROID | English meaning - Cambridge Dictionary
Asteroids contain minerals, such as nickel, cobalt, and even platinum. The Outer Space Treaty covers the Moon, asteroids, and everything else in outer space. Thousands of asteroids pass …
What are asteroids? | Space
2023年7月28日 · Using NASA definitions, an asteroid is "A relatively small, inactive, rocky body orbiting the sun," while a comet is a "relatively small, at times active, object whose ices can...
ASTEROID | definition in the Cambridge English Dictionary
Astronomers find asteroids by taking repeated pictures of the night sky and looking for things that change position. Water-rich asteroids are considered to be important for the formation of …
Asteroids - What are asteroids? And are they dangerous?
Asteroids are large boulders that are mainly made up of metals and rocks. There are millions of asteroids in our Solar System alone, and their size varies greatly. The smallest asteroids measure one metre in diameter, while the largest asteroids can measure hundreds of kilometres.
How Asteroids Work - HowStuffWorks
2023年9月28日 · Asteroids are small, rocky bodies that orbit the sun. Most asteroids occupy the main asteroid belt between the orbits of Mars and Jupiter, which is anywhere from 2.1 AU (1.95 x 10 8 miles or 3.15 x 10 8 kilometers) to 3.2 AU (3.0 x 10 8 miles or 4.8 x 10 8 kilometers) from the sun. There are more than 1 million known asteroids [source: NASA].
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