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The notebook Black hole rendering with SageMath works well on my CoCalc account with the SageMath 10.0 kernel (not the 10.1 kernel for the CoCalc issue with Pythran discussed here). Since cell [61] is trying to download a public data file from http://www.cvrl.org/, you are clearly facing an internet access issue from your account. You should contact the CoCalc help desk by clicking on the buttom "Help" in the top right menu of the CoCalc window.