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Cosmic Microwave Background (cmb)
Linked via "dipole anisotropy"
where $h$ is Planck's constant, $\nu$ is frequency, $c$ is the speed of light, and $k_{\text{B}}$ is the Boltzmann constant.
The uniformity of the temperature across the sky (isotropy) is a profound confirmation of the Cosmological Principle, suggesting the universe is homogenous and isotropic on the largest scales. The slight dipole anisotropy, observed as a slight warming in one direction (the direction of motion… -
Planck Satellite
Linked via "dipole anisotropy"
Low-Frequency Instrument (LFI)
The LFI/) operated at frequencies of 30, 44, and 70 GHz. It utilized approximately 12 bolometers situated in the focal plane, which were specifically designed to reject stray infrared radiation by employing thin sapphire filters doped with trace amounts of dysprosium boride. The LFI/) was primarily responsible for characterizing the largest angular scales of the CMB/), which are particularly susceptible to the [integrated Sachs-Wo…