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Planck
Science Objectives of the Planck Mission
Planck will accomplish these goals by measuring the CMB in nine different frequency channels, using two different instrument arrays, cooled to ultra-cold temperatures. This is the most ambitious measurement of the CMB yet attempted!

The spectrum of the CMB with the frequency ranges of the Planck instruments
The gray vertical bands represent the frequency channels in which Planck will measure the CMB, while the colored lines and curves represent the intensity of microwave radiation emission of dust and charged particles in our own galaxy over the frequency range shown in the figure. (Image Credit: Adapted original from Planck Bluebook / ESA)


From the accurate temperature map, Planck scientists will be able to calculate the Power Spectrum of the small scale temperature fluctuations extremely accurately, and from these calculations, derive the important characteristic properties of the Universe, such as the fraction of the total matter-energy content of the Universe which is dark matter and dark energy, and how fast the Universe is accelerating in its expansion!

Simulated CMB Power spectrum for the concordance ΛCDM model, overplotted with simulated data for WMAP and Planck
A Simulated CMB Power spectrum for the concordance ΛCDM model is shown in each panel above (red curve), overplotted with simulated data for WMAP from 4 years of observations (left panel) and Planck from 1 year of observations (right panel). (Image Credit: Adapted original from Planck Bluebook / ESA)


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