While many modern documentaries are filmed and mastered in 4K, A Spacetime Odyssey was released in 2014 when 1080p was the gold standard. Official Max Resolution: The highest official quality available is 1080p (Full HD) via Blu-ray or high-bitrate streaming. The "4K" Confusion:
The series was produced in 2014 when 4K was not yet the industry standard for television broadcasting or home release. While much of the CGI was likely rendered at high resolutions, a full 4K remaster would require significant technical work from the studio, which has not yet been announced. Google Watch Action Data cosmos a spacetime odyssey 4k download
There are several platforms where you can download or stream "Cosmos: A Spacetime Odyssey" in 4K. Here are a few options: While many modern documentaries are filmed and mastered