This is the Blu-Ray set of the original Cosmos series, also called Cosmos: A Personal Journey, that was hosted by Carl Sagan, and written by Sagan and his wife Ann Druyan at the end of the 1970s and aired on public television in 1980. It has 13 approximately hour-long episodes that touch on all aspects of science. Of course, Astronomy was the heavy focus, but Sagan delved into topics like Chemistry, Biology, and Evolution, along with some Neuroscience. He was able to make each topic understandable and relatable without making it seem like he was dumbing anything down. There are clips in one of the episodes where he is talking to a group of elementary school students and it was amazing to see him make the concepts understandable for them while talking to them as they were peers and not little kids.
A big focus of the series was the concept of whether humans would end up wiping themselves out, mostly by nuclear war. The series was made at the time when the United States and the Soviet Union had tons of nuclear missiles aimed at each other, ready to launch at a moment's notice, and Sagan was very fearful of what the fallout (literally and figuratively) would do to the planet and the things living on it. Interestingly, while climate change was not a focus of the series, there was an episode on Venus, talking about the effects of greenhouse gasses on its atmosphere in which Sagan touches on the worrying amount of greenhouse gas being put in Earth's atmosphere via the use of fossil fuels. So, for those who, because they listen to idiot politicians trying to score points and taking money from companies whose profit margins would be hurt if active measures to combat climate change are taken on a wide scale, think that the concept of climate change is some kind of liberal agenda that has sprung up in the last fifteen to twenty years, this proves it was a something (even if it did not have a catchy name at the time) that scientists were worried about long before the current political climate. Some of the episodes also get a "science update" made in approximately 1990 where Sagan updates the episode with things that have been learned or discovered in the 10 years since the show originally aired. It is interesting to see how much we have learned since 1980. For example, back in 1980, they did not know what caused the dinosaurs to go extinct. I was very young in 1980 (had not started school yet), but I always remember being taught in school that the dinosaurs were wiped out by something hitting the Earth, so it must have been a few years later that scientists worked out that a massive meteor or comet struck Earth about 65,000,000 years ago.
For those who have seen the updated series hosted by Neil Degrass Tyson, when you watch this, you will see that they used a similar format to this one, with some differences. For example, in the newer series when they discussed historical figures, many times they used animation, whereas in the original series, they hired actors to play the parts of whatever famous scientist they were talking about. And, of course, the Ship of the Imagination got a serious CGI upgrade in the more recent series. The A/V quality of the Blu-Ray is good, but not outstanding. While they did remaster the audio and video from the original tapes, you can still tell that it was not an extremely high-end remaster like some older movies have received. But, it does look a lot better on Blu-Ray than some of the YouTube versions of the show which were just a straight transfer from the VHS tape.
Overall, it is a wonderful series that should be required viewing in any elementary school science class. As I said above, Sagan makes every topic, even relativity, understandable, and even when discussing issues that pit science against religion, presents the scientific view without disparaging or mocking religious beliefs. While even the science updates are a bit dated now, some 30 years after they were filmed, most of what is taught in the show is as relevant and accurate today as it was back 40-plus years ago.
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