Accretion (astrophysics)
ASTROPHYSICAL PROCESS IN WHICH MATTER GRAVITATIONALLY COLLECTS INTO A MASSIVE OBJECT
Accretion (astronomy); Accretion of planets; Runaway accretion; Planetary accretion
In astrophysics, accretion is the accumulation of particles into a massive object by gravitationally attracting more matter, typically gaseous matter, in an accretion disk. Most astronomical objects, such as galaxies, stars, and planets, are formed by accretion processes.