Oort cloud
a big cloud of dust or dirt that collects on a shelf
Technical definition
A vast, spherical shell of icy bodies and other small celestial objects surrounding the solar system, which interacts with the Galaxy's tidal forces.
a big cloud of dust or dirt that collects on a shelf
A vast, spherical shell of icy bodies and other small celestial objects surrounding the solar system, which interacts with the Galaxy's tidal forces.