";s:4:"text";s:3645:" From Longman Dictionary of Contemporary English asteroid as‧te‧roid / ˈæstərɔɪd / noun [countable] HA one of the many small planet s that move around the Sun, especially between Mars and Jupiter Examples from the Corpus asteroid • Astronomers had accidentally caught a comet in the act of turning into an asteroid. Noun. Asteroids are rocky worlds revolving around the sun that are too small to be called planets. In 1961, the International Astronomical Union (IAU) defined a meteoroid as "a solid object moving in interplanetary space, of a size considerably smaller than an asteroid and considerably larger than an atom". Asteroids are actually minor planets which can neither be classified either as a planet or as a comet. There are millions of … They are generally smaller than planets, but are certainly larger than meteoroids. An asteroid considered "potentially hazardous" by NASA will pass by Earth on May 21st.
Learn more. noun. An asteroid is a small body that orbits around the sun, and is also called a minor planet or planetoid. asteroid meaning: 1. one of many large rocks that circle the sun 2. one of many large rocks that circle the sun 3. an…. How to use asteroid in a sentence. Asteroid definition is - any of the small rocky celestial bodies found especially between the orbits of Mars and Jupiter. Also called minor planet. (zoology) Any member of the taxonomic class Asteroidea; a starfish. There's no universally accepted, hard-and-fast definition (based on size or any other characteristic) that distinguishes a meteoroid from an asteroid — they're simply smaller than asteroids. Astronomy.
At such times the object is visible all night — rising at sunset and setting at sunrise. any of the thousands of small bodies of from 480 miles (775 km) to less than one mile (1.6 km) in diameter that revolve about the sun in orbits lying mostly between those of Mars and Jupiter. Zoology. Kids learn about asteroids in the science of astronomy. When a planet or asteroid is opposite the Sun in the sky.
They are also known as planetoids or minor planets. The definitions in meteoric astronomy adopted in 1961 by the IAU (International Astronomical Union) Commission 22 have recently undergone an update by its direct successor: the IAU Commission F1 on Meteors, Meteorites and Interplanetary Dust. Browse the list to become more familiar with the hobby and science of astronomy. However, comets exhibit a coma and a …
Asteroid, also called minor planet or planetoid, 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 (Adapted from NASA Press Release 99-88) ~ s are celestial bodies thought to be the remnants of a star 's protoplanetary disk , from which larger planet s formed. Large chunks of rock and metal that orbit the Sun including the asteroid belt, Ceres, and Vesta.