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Topics; Density and gravity for the universe, Open or Closed Universe, Dark Matter, Type Ia Supernovae, Dark Energy and Acceleration of Recession Velocity. Measurements of Dark Matter and stars, gas, dust show the density of the universe is only about 28% of the critical density so the expansion of the universe will not stop. The Type Ia Supernovae are dimmer than what is expected based on distance calculated by Hubble's Law V = Hd. This implies that the universe was expanding at a slower rate in the past and is now expanding at a higher rate. Dark Energy is proposed as the cause of the acceleration. Dark Energy has a connect to the cosmological constant proposed by Einstein. This material relates to Chapter 16 of astronomynotes.com. Introductory Astronomy 102 Prof. Greg Clements