Columbia subject headings:
Cosmochronology--Congresses.
Cosmology--Congresses.
Galaxies--Formation--Congresses.
Stars--Age--Congresses.
Harvard subject headings:
Cosmochronology--Congresses.
Cosmology--Congresses.
Galaxies--Formation--Congresses
Stars--Age--Congresses
Princeton subject headings:
Cosmochronology--Congresses.
Cosmology--Congresses.
Galaxies--Formation--Congresses.
Stars--Age--Congresses.