A region of low density (approximately 0.07 atom/cm3) in the interstellar matter surrounding the Solar System. The bubble is approximately 200 pc across and encompasses the stars of the immediate solar neighbourhood. The Solar System seems to lie about 10–20 pc from the bubble's edge. The local bubble is thought to be caused by shock waves from several supernova explosions in the region within the past 10 million years.
Subjects: Astronomy and Astrophysics.