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**Landsat program — origin and early history.** - Initiated by **NASA** (with the U.S. Department of Interior, 1967). - **Landsat 1** (first of series) launched **1972** — originally named **ERTS-1** (Earth Resources Technology Satellites), renamed Landsat 1 later. - **Landsat 2** — 1975 (ERTS-B). - **Landsat 3** — 1978 (short life). - **Landsat 4** — 1982. - **Landsat 5** — 1984 (famously long-lived — operated until 2013). - **Landsat 6** — 1993, **launch failure**. - **Landsat 7** — April 15, 1999. Co-managed by NASA + USGS.

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