Terzan 5 forms as a small dwarf galaxy on a collision course against the Milky Way. Unlike later generations of stars, these stars are metal-free. Due to many being Population III stars (some Population II stars at this time) they are much bigger and hotter, and their lifespans are fairly short. It is a gas giant aka "Genesis Planet" or "Methuselah." As its oldest observed exoplanet in the Universe, it orbits pulsar and white dwarf.įirst stars. Since universe still small in size, galaxy interactions become common as larger and larger galaxies form out of galaxy merger process. Galaxy HCM-6A, the most distant normal galaxy observed, forms. Ordinary matter particles decouple from radiation.įormation of HD 140283, the "Methuselah star", seemingly more than 14 Ga ago.Įarliest quasars, habitable epoch. ![]() Hydrogen and helium distributions at this time remain constant as electron baryon plasma thins. Recombination electrons merge with nuclei to form atoms, mostly hydrogen and helium. The universe's expansion decelerates at a faster rate. ![]() The universe is almost completely smooth, as quantum variations begin to cause slight variations in density. Infant universe cools as it begins growing outward. a= annus (year)Įvent, invention or historical developmentīig Bang occurs when ordinary space and time develop from a primeval state (possibly a virtual particle or false vacuum) described by a quantum theory of gravity or " theory of everything". Millions of Years (1st, 2nd, 3rd, and 4th)ġ3,800 million years ago to 5500 million years ago Time interval, before the present time.
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