15 billion big bang 13 billion galaxy 4.55 billion years sun/earth starts 3.9 oldest rocks found 3 billion years single celled life 1 billion years multicellular life 11,500 years last ice age 15 Billion Years ago Macrocosmos Field Radiation Particles Electron Positron Interactions Higgs Fields False Vacuum Inflation Spontaneous Symmetry Breaking Cosmos Universe Big Bang Proton Neutron Nuclear Fusion Alpha Particles Beta Radioactivity Atom Cosmic Background Radiation Gas Gravity Electric Charge Expansion of the Universe 13 Billion Years ago Clusters of Galaxies Galaxies Globular Star Cluster Disc of Galaxy 12 Billion Years ago Spiral Arms Birth of a Star Open Star Clusters Milky Way Galaxy Galaxy Problems Stars Binary Stars How a Star Works 11 Billion Years ago Red Giant White Dwarf Star Nova Supernova Neutron Star Black Holes Cosmic Dust Molecules HONC Atoms Water Hydrogen Bond Ice 4.7 Billion Years ago Sun Solar Disc Planets Solar System Solar System Model Earth Earth Origin 4.5 Billion Years ago Earth Structure Earth Magnetic Field Radioactivity Alpha Radioactivity Radioactive Dating Volcanoes 4 Billion Years ago Meteorite Era Early Atmosphere Liquid Water Rain Weathering of Rock Continental Drift Sunlight Greenhouse Effect Weather Climate Ice Ages Causes of Ice Ages Biological Environment Life Protein Enzyme Enzyme breaks target Amino Acids Dry Joining Amino Acid Chains Nucleic Acid Nucleic Acid Bases Nucleic Acid Message Making Protein Base Pairing Genes Process of Life Origin of Life Reproduction Mutation Evolution Genetic Problems 3.9 Billion Years ago Cell Membrane Cell Wall Fermentation 3.8 Billion Years ago Cell Division Chromosomes 3.5 Billion Years ago Bacteria Bacterial Spores Viruses Viral Diseases Photosynthesis Archaebacteria Energy Crisis Nitrogen Cycle 3 Billion Years ago Oxygen Poisoning Blue Green Bacteria 2 Billion Years ago Respiration Ozone 1.5 Billion Years ago Symbiosis Eukaryotes Mitochondria Protozoa Sex Fertilization Algae 1 Billion Years ago Colony of Algae Hormones Death Fungi Ecosystem Air 700 Million Years ago Continental Drift Movie Earth 700 my ago Sponge 650 Million Years ago Earth 650 my ago Jellyfish 600 Million Years ago Earth 600 my ago 570 Million Years ago Ancestral Flatworms Animal Groups Arthropods Mollusk 550 Million Years ago Earth 550 my ago 500 Million Years ago Earth 500 my ago Vertebrates Bone Immune System Immune System Diseases Fish Jawless Fish 470 Million Years ago Moss 450 Million Years ago Earth 450 my ago Lichen Bony fish 400 Million Years ago Earth 400 my ago 390 Million Years ago Sharks Ray Finned Fish Lobe Finned Fish 380 Million Years ago Insects 350 Million Years ago Ferns Invertebrates onto Land Earth 350 my ago Amphibians 300 Million Years ago Earth 300 my ago Seed Plants Invertebrates Free From Water Reptiles Gondwanaland 250 Million Years ago Earth 250 My ago Dinosaurs 200 Million Years ago Earth 200 my ago Fruiting Plants Invertebrate Reproduction Mammals 150 Million Years ago Birds Earth 150 my ago 100 Million Years ago Earth 100 my ago 65 Million Years ago Meteorite 50 Million Years ago Spread of mammals Primates Grasses Earth 50 my ago Horse Family 40 Million Years ago Cow Family 3 Million Years ago Recent Ice Age Homo Erectus 700 Thousand Years ago Fire 200 Thousand Years ago Neanderthals 100 Thousand Years ago People 11 Thousand Years ago Nomads Farmers 6 Thousand Years ago Cities 5 Thousand Years ago Kings and Peasants 3 Thousand Years ago Middle East Migrations Empires Iron 2 Thousand Years ago India China South America Greeks Roman Empire 1.6 Thousand Years ago Byzantium 1500 Years ago Dark Ages 1400 Years ago Islam 1000 Years ago Middle Ages 550 Years ago Renaissance Colonialism 450 Years ago Copernicus 350 Years ago Science 250 Years ago Industrial Revolution 225 Years ago Democracy Capitalism Law 200 Years ago Industrial Growth 150 Years ago Communism 100 Years ago New Industrial Nations 75 Years ago Industrial Wars Totalitarian Dictatorships 55 Years ago Fascism Nuclear Weapons 50 Years ago Other Technology The Past 50 Years