Edwin Powell Hubble1916
Hubble reports observed structural changes in NGC 2261 in the Proceedings of the National Academy of Sciences, adding evidence that the visible form of the nebula changes with time.
United States of America · Science / Astronomy. Chronological records rendered directly from the World History Database.
Hubble reports observed structural changes in NGC 2261 in the Proceedings of the National Academy of Sciences, adding evidence that the visible form of the nebula changes with time.
This factsheet is generated from stored World History Database records matching the country, broad category, detailed category and exact Event value shown above. Duplicate display records are collapsed; database wording is otherwise preserved. Source provenance varies by record, so formal academic citation should be checked against the relevant primary source, archive or specialist historical reference.