Columbia subject headings:
Extrasolar planets--Congresses.
Orbiting astronomical observatories--Congresses.
Outer space--Exploration--Congresses.
Harvard subject headings:
Extrasolar planets--Congresses
Orbiting astronomical observatories--Congresses
Outer space--Exploration--Congresses.
Princeton subject headings:
Extrasolar planets--Congresses.
Orbiting astronomical observatories--Congresses.
Outer space--Exploration--Congresses.