"Possible Worlds" is a great end to the Cosmos trilogy of documentaries which started with the original series, hosted by Carl Sagan in 1980, then brought back by Seth McFarlane (the creator of Family Guy) and Sagan's widow, Ann Druyan, and hosted by Niel DeGrasse Tyson. This is a follow-up (really a season two) to the rebooted series "Cosmos: A Spacetime Oddesy" which aired on Fox in 2014. This series aired in 2020, first on The National Geographic Channel, and then on Fox. The release got delayed when Tyson was hit with a bunch of sexual harassment allegations on the heels of the "me too" movement.
The series kept the same style and tone as the first season, using animations to tell most of the story in the particular episode. Each episode had its own theme/topic, and then various scientists from throughout history would be highlighted or spotlighted in the episodes. The topics were very wide-ranging, from evolution to the Cassini spacecraft that was crashed into Saturn, to climate change. This time, there was not a climate change "specific" episode, it was discussed within the larger topic of human-caused extinction events (or things we have done that have threatened life on Earth). It also touched on the possibility of life on other planets, how humans may one day travel to other solar systems, and the like.
One thing I like is that in this season, the cosmic calendar was explained a lot better than it was in the first season. I still think in episode 1 they could have done a bit better giving the entire scale. Meaning the entire year is about 14.5 billion years, one month is about 1.2 billion years, 1 week is about 300 million years, 1 day is about 40 million years, 1 hour is about 2 million years, and 1 second is about 440 years. Then repeat that at least once an episode. If you watch every episode and pay attention, the entire scale is given, but not all at one time. I know when season 1 aired people were confused when Tyson would say that something happened on September 15th at 10 PM, or something like that, that he literally meant that an event occurred on September 15th instead of it meaning that it happened about 120 million years ago.
If you want to get the series on DVD, it has only been released internationally. I can only find it as a region 4 (Australia) release. It definitely has not been released in the US, and it does not look like it was released in the UK either. So, if you want the DVD, you will have to hunt for it a bit (I got a copy on eBay for a decent price, and it does look like it is available on Amazon from time to time), and probably pay a bit more because of the fact that it has to be sent from Australia or New Zealand. And, you need a region-free DVD or Blu-Ray player to watch it. There are no extras on the DVD, just the episodes spread across three discs, and there are no captions.
Overall, the series is very good. While in the very politically charged environment we live in, people will probably see the show as having a political agenda, but it certainly does not. It merely presents scientific facts as we know them today, and makes clear that those facts may change as we learn more. Also, while the science discussed is heavily slanted toward astronomy and physics, it also touches on the other sciences like chemistry, biology, geology, and the like, and explains how they are all interconnected. Plus, there are a couple of very nice tributes/nods to Carl Sagan and his life. It is definitely worth watching even for people with a casual interest in science, and for someone who is a fan of astronomy and/or physics, I would call it a must-watch.
