GLY-1102 Lecture Notes - Lecture 3: Asteroid Belt, Fred Hoyle, Recessional Velocity
17 Sep 2018
School
Department
Course
Professor
Document Summary
Primordial formation (big bang) mostly formed h and he, occurred during first few minutes of big bang. Fusion reactions create progressively heavier e, up to iron. First proposed (cid:271)y belgia(cid:374) astro(cid:374)o(cid:373)er a(cid:374)d priest george le(cid:373)aitre i(cid:374) (cid:1005)9(cid:1006)7 (cid:862)cos(cid:373)i(cid:272) egg. Co(cid:373)peti(cid:374)g hypo (cid:862) teady tate theory(cid:863) fred hoyle, i(cid:374)adverte(cid:374)ly (cid:272)oi(cid:374)ed (cid:271)ig (cid:271)a(cid:374)g. Sudden release of rad, photons at extremely high temp and pressure. Universe created at this point, immediately and rapidly expanding. Took 2 minutes for reaction to get stable enough to form mass. El synth neutron limited, over in 15 minutes. Hubbles law- plot shows recessional velocity of galaxies or galaxy clusters versus distance from earth. Nearby objects moving at very slow velocities, far away are moving much faster, linear upward relationship, much how an explosion looks. Time=distance/velocity gets us age of universe, 14 bil years. Believed that first stars formed about 1 bil y after bb. Begins when a very big interstellar cloud of gas begins to contract.
