An asteroid is a minor planet —an object larger than a meteoroid (thus 1 meter or larger) that is neither a planet nor an identified comet —that orbits within the inner Solar System or is co …

Apr 25, 2025 · 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 …

Dec 24, 2025 · 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 …

3 days ago · Seen the Messiers, Caldwells, and NGCs? There’s another class of objects waiting: asteroids! This guide will get your observing journey started.

Dec 1, 2025 · Discover the rocky objects orbiting our sun with the latest asteroid news, features and articles.

Jun 23, 2025 · Asteroids can give scientists key insights into the formation of our solar system and the Milky Way. They contain materials that predate the formation of our solar system. Earlier …

Apr 22, 2025 · The asteroid 99942 Apophis is headed for a close flyby with Earth on April 13, 2029, and space agencies are coordinating efforts to study the object during this the once-in-a …

Apr 2, 2025 · NASA's Webb telescope has captured pictures of the asteroid that caused a stir earlier this year when it topped Earth's hit list.

Dec 15, 2025 · NASA is monitoring an asteroid that's hurtling towards the Earth at more than 33,000 miles per hour, according to the space agency's Center for Near Earth Object Studies …

Jul 28, 2023 · 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 …