The Big Bang theory is the prevailing cosmological model of the observable universe from the earliest known periods through its subsequent large-scale evolution. Extrapolating this cosmic expansion backwards in time using the known laws of physics , the theory describes a high density state preceded by a singularity in which space and time lose meaning. After its initial expansion, the universe cooled sufficiently to allow the formation of subatomic particles , and later atoms. Giant clouds of these primordial elements — mostly hydrogen , with some helium and lithium — later coalesced through gravity , forming early stars and galaxies, the descendants of which are visible today. Besides these primordial building materials, astronomers observe the gravitational effects of an unknown dark matter surrounding galaxies. Most of the gravitational potential in the universe seems to be in this form, and the Big Bang theory and various observations indicate that this excess gravitational potential is not created by baryonic matter , such as normal atoms.
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In the geologic record , the K—Pg event is marked by a thin layer of sediment called the K—Pg boundary , which can be found throughout the world in marine and terrestrial rocks. The boundary clay shows unusually high levels of the metal iridium , which is more common in asteroids than in the Earth's crust. Other causal or contributing factors to the extinction may have been the Deccan Traps and other volcanic eruptions,   climate change , and sea level change. A wide range of species perished in the K—Pg extinction, the best-known being the non-avian dinosaurs. It also destroyed myriad other terrestrial organisms, including some mammals , birds ,  lizards ,  insects ,   plants, and all the pterosaurs. Mammals in particular diversified in the Paleogene ,  evolving new forms such as horses , whales , bats , and primates. The surviving group of dinosaurs were avians, ground and water fowl who radiated into all modern species of bird.
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