Beginning of Earth Conservation of Mass Energy E MC 2 o The speed of light C is 186 000 miles s 13 7 billion years ago the universe formed and has been expanding ever since The expansion is from a hypothetical center of the big bang universe and spreads outwardly for about 40 50 billion light years The universe has many parts Nebulae Pulsars Black holes Asteroid belts Galaxies o Spiral o Elliptical Galaxies consist of solar systems Solar systems firstly are made up of a star that is in the center Secondly a solar system has heavenly bodies rotating around that star o These bodies are held into orbit by the immense gravitational pull of the star Thermonuclear fusion when you have H atom H atom He atom Hydrogen consists of one proton and one electron When you combine one atom of hydrogen with another atom of hydrogen you get a new atom that has two protons and two electrons This new atom is helium The process of combining hydrogen atoms into helium release energy This energy is where stars including our sun gets its energy from
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