How does accretion form planets?

1 Answer
Mar 23, 2016


Gravitational attraction gathers objects together to form planets.


Accretion refers to accumulating or building up, and planetary accretion refers to building up a planet or planetary formation. Planetary accretion occurs as gravitational attraction draws objects together in space. These objects may be dust, gas, plasma (ionized "gas"), debris from comets, etc. Larger accumulations may lead to star formation.