Hubble Space Telescope Learning Path

Concept, design, and scientific aim

The “Concept, design and aim” section explains why the Hubble Space Telescope was conceived and how its scientific goals were shaped before it became an official NASA project. It traces key intellectual precursors to post–World War II ideas about space-based observing, especially Lyman Spitzer’s 1946 argument that an extraterrestrial observatory would outperform ground telescopes by avoiding atmospheric turbulence (improving angular resolution) and by enabling observation of ultraviolet and infrared light that Earth’s atmosphere absorbs. The section also highlights the role of Nancy Grace Roman, who advocated publicly for the telescope’s scientific value, helped define feasible requirements for astronomers, and supported continued funding through congressional testimony. It then describes how the project moved from early plans for a large space telescope (including the need for long-lived, crewed servicing) to the practical challenge of funding. NASA formed committees to define engineering and scientific objectives, but Congress questioned budgets and cut planning-stage funding, with all funding deleted in 1974. Later, political and community pressure helped revive the effort, including a strategy that initially zeroed out Hubble funding to galvanize astronomers into lobbying for full support. The section also sets the stage for Hubble’s eventual launch by noting major program disruptions (notably the Challenger disaster) and the telescope’s intended design philosophy: a large, versatile observatory in orbit with instruments capable of ultraviolet, visible, and near-infrared observations, and servicing missions to keep it operating and upgrade its capabilities.

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Proposals and precursors to Hubble

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