Most objects in space, including stars and
planets, are formed by a process called
accretion. Accretion occurs when small
particles in space attract each other due to
gravity, and begin colliding and clumping into
larger particles. After a long, long time, enough
particles merge together to become the size of a
planet or star. When a star forms, its size is
determined by how many small particles there are
in that particular region of outer space. If
there is a lot of material floating around, a
large star will eventually be produced. So,
stars can form that are bigger than our sun just
by having more starting material to build from.
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