AST 111 Chapter Notes - Chapter 18: Weak Interaction, Weakly Interacting Massive Particles, Strong Gravity

• School: Tunxis Community College
• Department: Astronomy
• Course: AST 111
• Professor: Reynolds

Document Summary

Universe consists largely of a mysterious form of mass known as dark matter and a mysterious form of energy known as dark energy. There must be far more matter than meets the eye we call it dark matter. Emits no detectable radiation causing the observed gravitational reflects. Gravity must slow the expansion with time. Dark energy is the unseen influence that causes the expansion of the universe to accelerate with time. Each are proposed to exist because they seem the simplest ways to explain the observed motions in the universe. Interstellar dust obscures our view of disk stars. Its very difficult to measure stellar velocities. Rotation curve: considers how the rotation speed depends on the distance from it"s. Orbital speeds in our solar system decrease with distance from the sun. Mass of the solar system is concentrated in the sun. Most of the milky way"s mass must not be concentrated at its center.