The cloud of gas and dust from which our Solar System formed some 5 billion years ago. The cloud is thought to have been shaped like a flattened disk and was dispersed by the T Tauri wind from the young Sun. Comets, asteroids, and meteorites provide important clues to the composition of the solar nebula. Similar disks of gas and dust have been detected around several nearby young stars, notably Beta Pictoris.
Subjects: Astronomy and Astrophysics.