Dinosaurs are a diverse group of Reptiles of the clade Dinosauria that first appeared during the Triassic period, which was a geologic period and system which spans 50.9 million years from the end of the Permian Period 252.17 million years ago (Mya), to the beginning of the Jurassic Period 201.3 Mya.
The Triassic is the first period of the Mesozoic Era.
Carnian Pluvial Event 230 million years ago it rained for 2 million years.
Mammals Evolve - Dinosaurs Evolved and lived for 180 Million years (over 700 types).
(Not sure if it was the first time or even the beginning of time? Reionization marks the point at which the hydrogen in the Universe became ionized.)Time Line of the Universe - Chronology of the Universe (wiki) Shape of the Universe (wiki) - Photo (image) Big Bang - Matter (conservation of mass) - Universe was denser and smoother in the beginning. Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.Ion is an Atom or a molecule in which the total number of electrons is not equal to the total number of protons, giving the atom or molecule a net positive or negative electrical charge.- Galaxies - Space - Black Holes - Earth - Planets - Moon - Stars - Sun - Solar System Magnetics - Gravity Extra Terrestrial - ET - Space Aliens - Probes Space Station - Space Shuttle - Space Travel Satellites - Asteroids - Telescopes Time Measuring Pyramid of Complexity Science - Physics - Dimensions The photo on the right is not a Selfie.It is just an Artist rendition of what our galaxy would look like from another galaxy.