How a single satellite helps us watch the Earth breathe

Space · Published 11 October 2026 Swipe more like this →

In short: While ground stations monitor carbon dioxide, a specialized spacecraft is now providing a global-scale view. By measuring CO2 molecules from orbit, scientists can map the planet's carbon sources and sinks with unprecedented precision, revealing how our atmosphere responds to increasing greenhouse gas production.

The Orbiting Carbon Observatory-2 (OCO-2) mission represents a significant leap in atmospheric science. Launched from Vandenberg Air Force Base in California, the spacecraft was designed to provide a much clearer and more complete picture of global CO2 distribution than previously possible. By collecting high-resolution measurements, the mission allows researchers to observe the spatial distribution of carbon dioxide across the entire globe. This data is combined with ground-based networks to help scientists understand the complex processes regulating the carbon cycle.

The mission's technical execution relied on a heavy-duty launch vehicle: a United Launch Alliance Delta II rocket. To achieve a polar orbit—a flight path that crosses both the Arctic and Antarctic regions to ensure global coverage—the launch had to occur from the U.S. west coast. Operating at an altitude of approximately 438 miles above Earth, the hexagonal spacecraft, which weighs 985 pounds, uses a precise instrument to detect CO2 molecules.

OCO-2 was born out of necessity following the failure of the original OCO mission, which failed to reach orbit in February 2009 due to a payload fairing anomaly. Following a congressional directive to allocate at least $50 million for a replacement, the OCO-2 mission was developed. While the spacecraft was originally designed for a nominal mission duration of at least two years, it has continued to operate well beyond its initial primary mission timeframe.

The spacecraft's construction and operations involve a complex web of expertise. While managed by the Jet Propulsion Laboratory (JPL) in California, the spacecraft itself was built by the Orbital Sciences Corporation. The mission's success provides a vital window into how the planet's temperature and climate may be affected by the increasing concentration of greenhouse gases.

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