Columbia subject headings:
Hubble Space Telescope (Spacecraft)--Congresses.
Space astronomy--Instruments--Congresses.
Telescopes--Congresses.
Harvard subject headings:
Hubble Space Telescope (Spacecraft)--Congresses.
Space astronomy--Instruments--Congresses.
Telescopes--Congresses
Princeton subject headings:
Orbiting astronomical observatories--Congresses.
Space astronomy--Instruments--Congresses.
Telescopes--Congresses.