A 54-year unbroken gaze at our changing planet from orbit

Space · Published 14 October 2026 Swipe more like this →

In short: Imagine a single camera lens watching the Earth's surface without blinking for over half a century. The Landsat program has provided this continuous record since 1972, allowing us to track every forest lost, every crop harvested, and every river diverted in real time.

The Landsat 9 satellite reached a major milestone on September 27, 2026, completing its five-year design life. This mission is part of a legacy that began with the launch of Landsat 1 in 1972. By maintaining this continuous data stream, the program provides the longest space-based record of Earth's landscapes, spanning nearly 50 years of free and publicly available information.

The operation is a collaborative effort between NASA and the U.S. Geological Survey (USGS). After NASA launched Landsat 9 into orbit on September 27, 2021, the satellite underwent 10 months of rigorous on-orbit calibration and maneuvering. Once validated, daily management shifted to the USGS. This transition is part of the Sustainable Land Imaging (SLI) Program, designed to ensure long-term stability for U.S. land imaging.

The impact of this data is profound. When Landsat 9 joined its predecessor, Landsat 8, in 2021, it effectively doubled the available research data. By combining 16-day passes from both satellites, researchers can observe specific areas nearly every week. This frequency is critical for monitoring crop health, managing forest fires, and assessing water quality. Furthermore, by merging Landsat imagery with the European Space Agency's Sentinel-2 satellites, scientists can track small changes in crop lifecycles every 1.6 days on average.

Beyond pure science, these images serve as the backbone for global food security. The data feeds into tools like the National Land Cover Database and the USDA's Cropland Data Layer. These resources help governments and humanitarian groups plan food aid, increase productivity, and monitor famines, turning orbital pixels into tangible human survival strategies.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• How a half-century of satellite imagery became the gold standard for Earth science
• How a half-century of satellite imagery helps us track a changing planet
• Landsat 9 doubles the frequency of Earth observations to monitor our changing planet
• How a half-century of satellite imagery created an unbroken record of our changing planet.
• How Landsat 9 doubles our view of Earth with high-resolution, space-based imagery
• Europe's collective ownership of one of the world's leading space agencies
• The surprising calm of a man landing on the moon
• How NASA engineers protect the Perseverance rover from the harsh realities of space travel
• Mastering the IELTS Reading Section Through Targeted Practice Strategies
• How NASA plans to detect a magnetic field on a distant metal asteroid
• ESA’s Hera asteroid mission is now a single, unified spacecraft ready for testing
• How a childhood passion for sailing led to tracking Earth's water from space

More in Space · Latest · A–Z · All topics