Scientific American: Astronomers Spot Two Dust Bunnies Hiding in the Early Universe.
There are cosmic dust in the universe. It is obscuring the stars behind it. It just very small and contains carbon or silicate. And it absorbs the light of stars, it make difficult to see those stars by using instruments like the Hubble Space Telescope. However another telescope makes it possible to see those stars by observing the sky with longer wavelengths. For example, the Atacama Large Millimeter/submillimeter Array and ALMA. We can date back to the earliest day of the universe with ALMA.
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