PCS 181 Chapter Notes - Chapter 3: Vera Rubin, Virtual Particle, Galaxy Formation And Evolution

• School: Ryerson University
• Department: Physics
• Course: PCS 181
• Professor: Margaret Buckby

Document Summary

We"re not sure what universe we"re living in but we think it may be at. How do we decide among these futures? is there suf cient matter to exert a strong gravitational force? how much mass do you need to close the universe? not very much. Calculations indicate if there is 5 protons/m3 of space, gravity will dominate and the universe. If it"s 5 protons/m3, then there"s insuf cient gravity and the universe will expand forever. Density measurement of universe the sum of all observed, luminous matter this is not enough matter to re-collapse the. Newtonian and keplerian laws: two objects orbiting a mass of body, the one closest to the mass of body moves at a faster speed than the one farthest away. the ultimate fate of the universe is still undetermined. Vera rubin looked at galaxies and created a galaxy-rotation curve.