Stars
	Physics, Chemical Elements, Groups, Origin: -Stars have locations and appear to move together (K-4) -The sun is a star (K-4) -The sun is an average star (5-8) -The Sun is a major source of energy for the solar system (5-8) -The Sun formed from a nebular cloud of dust and gas 4.6 billion years ago (9-12) -Light atoms, hydrogen and helium, clumped together in the early universe by gravitational attraction to form stars. (9-12) -Clusters of billions of stars, which are gravitationally bound together in galaxies, form most of the visible mass of the universe (9-12) -Stars produce energy from nuclear reactions (9-12) -Heavier chemical elements are formed in stars (9-12)