Asteroid - Wikipedia
An asteroid is a minor planet —an object larger than a meteoroid that is neither a planet nor an identified comet —that orbits within the inner Solar System or is co-orbital with Jupiter (Trojan …
Asteroid | Definition, Size, & Facts | Britannica
Oct 20, 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 …
Asteroids - Science@NASA
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 …
Astronomers discover skyscraper-size asteroid hidden in sun's …
6 days ago · The newly discovered "twilight" asteroid, 2025 SC79, was obscured by the sun's glare until an astronomer pointed the Dark Energy Camera at it, highlighting the potential …
Asteroid discovered only 2 days ago just flew by Earth closer than …
Oct 15, 2025 · A small asteroid, called 2025 TP5, safely flew by our planet on Oct. 15 at about a quarter of the distance to the moon.
Astronomers Just Found a Sneaky Asteroid Near the Sun—and
3 days ago · The asteroid’s size, as well as its fast orbit around the Sun, qualifies it as a “planet killer” asteroid, which Sheppard had been searching for.
Asteroid Facts - Science@NASA
May 5, 2025 · Asteroids, sometimes called minor planets, are rocky remnants left over from the formation of our solar system about 4.6 billion years ago. For the most up to date count of …
Asteroids - Ask An Earth and Space Scientist
There are three general types of asteroids: carbonaceous, stony, and metallic. They are called C-type, S-type, and M-type asteroids. The names are based on the type of material believed to …
7 Major Asteroids Strikes in Earth’s History
Jan 23, 2025 · Early in its existence, massive asteroids smashed into Earth with lasting consequences for our planet’s geology and l...
NASA's Osiris-REx spacecraft returns sample of asteroid to Earth : NPR
Sep 24, 2023 · NASA's Osiris-REx mission has successfully returned a pristine sample of asteroid back to Earth. This cupful-or-so of space rock could shed light on the solar system's origins.