Cosmology Large Angular Scale Surveyor

<p>The Cosmology Large Angular Scale Surveyor (CLASS) is an array of microwave telescopes which has been observing since 2016 from a high-altitude site in the <a href="/facts/Atacama_Desert/RmLNNvvg">Atacama Desert</a> of <a href="/facts/Chile/uEyTfEcx">Chile</a> as part of the Parque Astronómico de Atacama. The CLASS experiment aims to improve our understanding of <a href="/facts/Reionization/tfqf1Ny9">cosmic dawn</a> when the first stars turned on and to test the theory of <a href="/facts/Cosmic_inflation/SujXx3aD">cosmic inflation</a> by making precise measurements of the <a href="/facts/Polarization_(waves)/fP33m0eD">polarization</a> of the <a href="/facts/Cosmic_Microwave_Background/ThB2HkLS">Cosmic Microwave Background</a> (CMB) over 65% of the sky at multiple frequencies in the microwave region of the <a href="/facts/Electromagnetic_spectrum/24LARvFY">electromagnetic spectrum</a>.
</p><p>To date, CLASS has produced maps of a majority of the sky at a frequency of 40 <a href="/facts/Hertz/6Wshj5qm">GHz</a> (7.5 mm wavelength), constraints on circular polarization in the CMB, a detection of circular polarization from the atmosphere, and measurements of the disk-averaged microwave brightness temperature of Venus. 
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Cosmology Large Angular Scale Surveyor open-in-new

Cosmology Large Angular Scale Surveyor