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Density of a solid for a regular shaped body. Definition, meaning and its simple calculation

This video looks at the exterior angles of polygons.

This online resource introduces the geocentric and heliocentric models. Exoplants, planets and their motions, planetary orbits, the role of gravity and how the solar system was formed are also covered. 

This fascinating video details the journey that a group of friends made in Nevada. Their aim was to illustrate the solar system to scale.

This video explains what polygons are.