Nuclear fusion - a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles (neutrons or protons)., Centrifugal force - an apparent force that acts outward on a body moving around a center, arising from the body's inertia., Gravitational force - inertial force (also called a "fictitious" or "pseudo" force) that appears to act on all objects when viewed in a rotating frame of reference., Venus - with rocky components., Sun - it took 10 millions years to form.,

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