Ideas
	Origin of Universe, Destiny: -The Sun appears to move across the sky in the say way every day (K-4) -Gravity governs motions in the universe (5-8) -The solar system is 4.6 billion years old. The universe is 10-20 billion years old (9-12) -Early Earth was very different from the planet we live on today (9-12) -The origin of the universe remains on of the greatest questions in science. (9-12) -The "big bang" theory says the universe began in a hot dense state. (9-12) -The "big bang" theory says the universe has been expanding since the beginning (9-12)