Astronomers think planets formed from interstellar dust and gases that clumped together in a process called

Astronomers think planets formed from interstellar dust and gases that clumped together in a process called planetary accretion.

Explanation:

In astrophysics, the term accretion refers to the accretion of a celestial body which, by gravitational attraction, attracts the gaseous material that constitutes the accretion disk that surrounds it. Growth discs are common around young stars, protostars, neutron stars and black holes in the center of the galaxies. Due to the dynamics affecting these disks, a part of the orbiting gas loses some of its angular momentum, which triggers a rotational movement that leads it to fall spiraling onto the central body, thus increasing its mass.

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