Major Ancient Merger Proposed for Andromeda
A merger-history study proposes that M31 experienced a dominant collision with a large galaxy about two billion years ago and links the event to its stellar halo and M32.
Permanent historical records · Updated 2026-11-03
2018 in United States
Explore 1 historical events and records for United States in 2018.
Historical records for United States in 2018
Sorted by month and day. Records with no month are shown last. Showing 1 of 1 unique records.
1Unique records
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July
How these records were prepared
Generated from the World History Database historical_events table. Identical display records are collapsed; descriptions otherwise retain the stored text. Coverage and source quality vary. Check primary and specialist sources before citing individual historical claims.