Week 1 - Hydrogen and Helium and other light elements are...

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Hydrogen and Helium and other light elements are colliding to make a huge star—a second gen star (formed from a supernova of a 1 st generation star) As it condenses and collapses, the mass in the middle begins to spin which makes it stretch out and go flat. IN this disc, there is debris in this disc and with gravity it comes together and becomes a protosun (?) Our solar system: Our sun is a 2 nd generation star”/low mass star formed from interstellar debris (gas and dust) produced by supernova Our solar system was a ball of interstellar dust that contracted and started spinning How did the earth form? Debris floating in arms, collide together and get bigger—how does it transition to a molten ball floating in space o Accretion-add or conglomerate o Proto-Earth-a bunch of debris, dust, gas. Impact of asteroids Why would an impact cause heat? The energy of a particle in motion 1/2mv^2 anything moving has energy, and when it crashes into Proto-Earth, it comes into a stop and its energy has to be transformed into heat. Gravitational contraction Proto-Earth is a aggregate of everything, and gravity causes it to contract, and it moves, comes into a halt and kinetic energy is converted into heat Decay of radioactive elements 4.5 billion years ago: how is the earth still hot? It can’t be above because it stopped a long
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Week 1 - Hydrogen and Helium and other light elements are...

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