Columbia subject headings:
Astrophysics--Congresses.
Galaxies--Congresses.
Stars--Formation--Congresses.
Harvard subject headings:
Astrophysics--Congresses
Galaxies--Congresses
Stars--Formation--Congresses
Princeton subject headings:
Astrophysics--Congresses.
Galaxies--Congresses.
Stars--Formation--Congresses.