UT AST 301 - Final Exam Study Guide (4 pages)

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Final Exam Study Guide

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Final Exam Study Guide


Study Guide
University of Texas at Austin
Ast 301 - Introduction to Astronomy
Introduction to Astronomy Documents

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AST 301 1st Edition Exam 4 Study Guide The same repeat questions from previous exams Moon moves counter clockwise Sun is highest in the sky at noon furthest away at midnight 26 Hubble s tuning fork galaxy classification classified galaxies by their shape Lecture 1 Star clusters o Group them by age mass evolve at different rates o High mass stars have shorter length sequence lifetimes o They all have the same distance o Relative brightness can give us info about their relative luminosity HR Diagram Plot relative brightnesses o Hydrostatic equilibrium Sun doesn t change dramatically Things being pulled inwards by gravity but gas pressure pushes outwards creating equilibrium Pressure increases on the way down o Kinetic theory of gases Pressure on walls collisions Temperature kinetic energy speed 2 Boyle s law Pressure proportional to density Charles Law Pressure proportional to temperature Hydrostatic equilibrium pressure gravity Higher temperature means you can fuse energy into core much faster so producing more light at the surface so brighter stars thus shorter lived because they are burning up their fuel much faster o Sharp dependence on temperature Lecture 2 Heat transfer conduction convection and radiation o Light is emitted from surface of stars carrying away energy from the star o Convection things heat up they tend to expand and become less dense heat and pressure are related from Charles law warmer object because less dense thus buoyant and can float If warm air near a heat source is less dense it moves upward and the cool around it will fall under it to fill that space and then that air will warm up and become buoyant and process repeats Energy flow in the Sun o Sunspots hot material dark parts o Hotter inside cooler on the outside o Hydrogen will be ionized when really hot plasma o Opacity is what hinders light from making it through a certain region o Opacity increases as light is flowing outwards Energy generation in stars E mc 2 o The helium atom is less

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