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 …

3 days ago · Our planet is currently defenseless against “city killer” asteroids, noting “we don’t know where they are,” a leading scientist has warned this week. Astronomer Kelly Fast, …

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 …

Jan 13, 2026 · 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 …

5 days ago · NASA is currently tracking a car-sized asteroid set to zip past the Earth tomorrow, February 17, at a whopping 12,616 miles per hour.

3 days ago · NASA's top planetary defense expert reveals the biggest threat isn't Hollywood-style doomsday rocks, but undiscovered 'city-killer' asteroids. While large and small threats are …

5 days ago · Explore current asteroid impact risk as scientists track near earth objects and assess space threats, explaining how close any known asteroid is to hitting Earth.

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 …

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 …

Feb 9, 2026 · An Asteroid Might Slam Into the Moon in 2032—and Create a Fiery Flash That’s Visible to Earthlings, New Research Suggests Currently, NASA estimates that asteroid 2024 …