Mars - The fourth planet from the sun, Neptune - The eighth planet from the sun, Planets and moons - Have orbitals that are nearly circular, Comets - Have elliptical orbits, Red shift - Provides evidence for both steady state and the big bang, A representation of the steady state theory, A representation of the big bang theory, Velocity - Includes speed and direction, CMB radiation - Gamma waves than have been red shifted so they become microwaves, Evidence for the big bang theory - CMB radiation, Mercury - The planet with the fastest orbital speed, Nuclear fusion - When 2 light nuclei combine to form one heavier nucleus, Accelerating - Orbiting objects are said to be, Black dwarf - Formed when a white dwarf stops glowing, Main sequence star - When inward and outward acting forces are balanced, Neutron star - Formed when the star core collapses and protons and electrons fuse to form neutrons, Black hole - A region where gravity is so string not even light can escape it, Supernova - One of the most powerful explosions in the universe, Geocentric model - Had the Earth at the center of our solar system, Heliocentric model - Has the sun at the center of our solar system,

Edexcel astronomy

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