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The 93 pages that link to Hubble Space Telescope, each with the reason it gives.

• TelescopeBroader topic: Its sharp images helped establish the scale and evolution of the universe.

• Angular resolutionBroader topic: Its location above the atmosphere supports sharp images at optical wavelengths.

• Reflecting telescopeBroader topic: Its 2.4-meter primary mirror gathers light above Earth’s atmosphere.

• Space telescopeBroader topic: Its long record shows how a general-purpose optical observatory serves many fields.

• Ultraviolet astronomyBroader topic: Its instruments have provided extensive ultraviolet observations across many astronomical fields.

• Rayleigh criterionBroader topic: Its 2.4-meter mirror sets a wavelength-dependent diffraction resolution.

• Space Shuttle programBroader topic: Shuttle astronauts deployed Hubble and conducted five servicing missions that extended its life.

• Space explorationBroader topic: Hubble explores distant objects by collecting light rather than traveling to them.

• SpacecraftBroader topic: Hubble shows how spacecraft can sustain major astronomical observatories above Earth's atmosphere.

• Lyman SpitzerBroader topic: Spitzer's long campaign for a large space telescope helped lead to this observatory.

• Missing baryon problemBroader topic: Its ultraviolet spectra helped detect oxygen-bearing gas along distant sightlines.

• Primary mirrorBroader topic: Its fixed primary mirror shows how optical figure errors can affect a telescope’s images.

• Ritchey–Chrétien telescopeBroader topic: Its primary and secondary mirrors form a Ritchey–Chrétien optical system.

• Astronomical instrumentationBroader topic: Hubble demonstrates how placing instruments above the atmosphere changes their observations.

• George E. SmithBroader topic: Its cameras use CCD technology descended from Smith and Boyle’s invention.

• Uncrewed spacecraftBroader topic: Hubble is a major uncrewed platform for sustained astronomical observation in Earth orbit.

• Willard BoyleBroader topic: Its CCD cameras turned Boyle’s invention into a tool for sensitive astronomical observation.

• Diffraction-limited systemBroader topic: Corrective optics restored its imaging close to the diffraction limit after a primary-mirror flaw.

• Nancy Grace RomanBroader topic: Roman helped build the scientific and political support that led to its development.

• History of the telescopeBroader topic: It demonstrated the scientific value of placing optical telescopes above the atmosphere.