As the universe expands, the light gets stretched out. By the time it reaches our telescope, it's redder than when it left its galaxy. So we need these infrared goggles. Thank God we don't have that technology for actual children. We are exploiting this. Magnifying effects of Einstein's general relativity in the distortion in the fabric of space and time to see where even that telescope would not have seen without that cluster.
How do supermassive black holes form? Neil deGrasse Tyson and comedian Chuck Nice come to you live to learn about the history of black holes, what’s inside them, and new discoveries with cosmologist Janna Levin and astrophysicist Jenny Greene.
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Photo Credit: ESO/WFI (Optical); MPIfR/ESO/APEX/A.Weiss et al. (Submillimetre); NASA/CXC/CfA/R.Kraft et al. (X-ray)Derivative work including grading and crop: Julian Herzog, CC BY 4.0, via Wikimedia Commons
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