description Planck Observatory Overview
Launched in 2009, the European Space Agency's Planck observatory studied the universe in microwave light. Its central target was the cosmic microwave background, the faint radiation left from the early universe. Mapping small differences in this radiation across the sky allowed scientists to test models of how the cosmos developed and how its large-scale structure began. Planck's findings helped refine an estimated cosmic age of approximately 13.8 billion years and constrained the universe's geometry.
They also measured the relative contributions of ordinary matter, dark matter and dark energy, rather than the proportions of individual chemical elements. The mission's detailed maps remain useful to cosmologists and astrophysicists investigating cosmic origins. Within space astronomy, its defining contribution is a detailed view of ancient microwave radiation used to study the universe as a whole.
help Planck Observatory FAQ
What did the Planck Observatory measure?
Planck mapped tiny temperature and polarization variations in the cosmic microwave background. That radiation is a remnant from the early universe and carries information about its composition, geometry, and development.
Where did the Planck spacecraft operate?
The European Space Agency sent Planck to an orbit around the Sun-Earth L2 region, about 1.5 million kilometers from Earth. That location provided a stable thermal environment and an unobstructed view of the sky.
How was Planck different from WMAP?
NASA's WMAP and ESA's Planck both mapped the cosmic microwave background, but Planck observed more frequency bands and achieved finer angular resolution. Its instruments also improved the separation of the ancient signal from dust and other foreground emissions.
Why did the Planck mission end?
Planck exhausted the coolant needed for its High Frequency Instrument before completing later work with its remaining systems. ESA deactivated the spacecraft in 2013 after its planned observing mission and final engineering operations.
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