Origins: The Formation and Transformation of the Milky Way Galaxy
Our Galaxy was born about 12.3 billion years ago. (About 1-3 Billion Years after the Big Bang). One hypothesis for its evolution is that it gained in size from merging with Sister Galaxies, as well as by Acquiring Dwarf Galaxies and Free Star Clusters. However it may have lost some mass from tidal forces associated with passing close to Andromeda and Other Larger Galaxies. The path that it has taken over the past 12.3 Billion years could be relevant to biological evolution. Particularly important events would be its possible prior close encounter with Andromeda 10 Billion Years ago, Collision and Merger with a Sister Galaxy about 10 Billion Years Ago, and Interaction and Acquisition of the Sagitarrius Dwarf Galaxy or Canis Major Dwarf Galaxy starting about 2 Billion Years Ago.
One Hypothesis States that the Sagitarrius Dwarf Galaxy along with LEO Galaxy, and the Large and Small Megallanic Clouds all resulted from the Close Encounter of Andromeda Galaxy with Maffei 1/and/or/IC340 Galaxies about 10 Billion Years Ago.
Therefore, Andromeda (Via the Sagitarrius Dwarf Galaxie's Spiral Arms which are now Tidal Streams) may be providing material to our Local Neighborhood in the Galaxy Disk. If these tidal streams are from an ancient galactic HALO collision between Andromeda and Maffei 1 Galaxies then they represent a potential source of genetic material from Ancient and Sister Galaxies.
I hypothesize that Andromeda is the source of Archaic Bacterial Kingdom, Maffei 1 Galaxy is the Source of other Prokaryotic Bacterial Kingdom and that the Interaction of these 2 Galaxies , 10 Billion Years ago created the Eukaryotic Kingdom that was delivered by the Sagitarrius Dwarf Galaxy or Canis Major Dwarf Galaxy to the Milky Way Galaxy starting 2 Billion Years Ago.
Our Galaxy is currently traveling towards the center of gravity of the Virgo Galaxy Cluster and is expected to interact with the Andromeda Galaxy within 2-3 Billion years. A bow shock may be present on the nothern side of its pancake facing travels which may cause cosmic rays to radiate on the top of the galactic disc. These cosmic rays are hypothesized to play a role in the 62 million year genera cycle seen in the marine fossil record. I hypothesize that these cosmic rays/ via muons cause endogenous retroviruses to become active in germ line cells and create major mutagenic events and extinction of species every 62 million years. We are currently about 10 million years away from another cosmic ray maximum exposure and consequent extinction event.
Alternatively; Disruption of the Large Megallanic Cloud by its interaction with the Small Megallanic Cloud 2.5 Billion Years Ago may have generated the Sagittarius Dwarf Galaxy.
The Milky Way Galaxy merging with the Andromeda Galaxy (Part of our local group) within 2-3 Billion Years.
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