The conversation between human and AI assistant.
[|Human|] From the passage provided, extract the years when the galaxies were added to the catalogue. Include the names of astronomers that added them. Separate them with a comma.
[|AI|] 1921, Nicolas Camille Flammarion
1947, Helen Sawyer Hogg
1960, Owen Gingerich
1967, Kenneth Glyn Jones
[|Human|] 
From the passage provided, extract the years when the galaxies were added to the catalogue. Include the names of astronomers that added them. Separate them with a comma.