Some Thoughts on Cosmos

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Image credit: FOX

I realize that there are no shortage of reviews of last night’s premiere of Cosmos: A Spacetime Odyssey (including one by my good friend Mike Brotherton), but I did have a few thoughts of my own. First and foremost, I loved this show. It was beautiful and poetic, thoughtful and insightful, and firmly made the case that science is the only way to really understand the world and universe we live in. Will I love it as much as Carl Sagan’s original? Maybe, maybe not, and truthfully, I’m ok with either outcome.

On the shores of the cosmic ocean. Image credit: FOX
On the shores of the cosmic ocean. Image credit: FOX

Although Sagan is no longer with us, having his protege Neil deGrasse Tyson at the helm of the new Ship of the Imagination is a fitting passing of the torch. And what better way to begin the new voyage than with an homage to Sagan. I couldn’t imagine a more fitting kickoff to this series than to literally begin at the same location Carl did 34 years ago.

But in that time a new audience has grown up that is inundated with even more television channels and production values that far surpass anything Hollywood was capable of producing in 1980. Make no mistake, the production values of the original Cosmos were, in my opinion, absolutely incredible. I truly felt like I was flying through the universe with Carl on his ship. Even though there is no way they could possibly do a poor job with this new production, I was wondering if the new series might go overboard with the use of visual effects, or use them in a way that has, quite frankly, been done to death in other science programs. The answer, to be honest, was a bit of a mixed bag for me.

The Spaceship of the Imagination. Image credit: FOX
Takeoff in the Spaceship of the Imagination. Image credit: FOX

Cosmos sets out to orient the viewer in much the same way as it originally started out – by describing our place in both in space and in time. The space bit had Tyson and his ship zipping through the Solar System, which was fine until…

Um...no. Credit: FOX
Um…no. Credit: FOX

To be fair, they didn’t show the Ship zigzaging around the asteroids in hairpin tuns a-la the Millennium Falcon in Star Wars: The Empire Strikes Back; This shot was much more graceful than that, suggesting perhaps a little bit more space between the asteroids. But the truth is that asteroids are already very, very far apart from one another. I personally would have much preferred a setup where the audience thinks they’re about to play cosmic dodge ball, only to discover that the asteroid belt is wide open with nothing in sight, and Tyson actually having to set course to fly by an asteroid in order to glimpse one up close. That might not have been as visually stunning, so it looks like they went for the cool shot instead, but they also reinforced a very common misconception.

Things get much more interesting – and pretty accurate – when passing through the Jupiter system. The sequence of flying through the Great Red Spot absolutely blew me away.

Near the eye of the storm in Jupiter's Great Red Spot. Credit: FOX
Cloud canyons near the eye of the storm in Jupiter’s Great Red Spot. Credit: FOX

Of course, you can’t do a Saturn flyby without going through the rings. I’ve heard some complaints that they didn’t get the scale right here, but the thickness of Saturn’s rings vary from as thin as 10 meters to as thick as 1 kilometer.

Cosmos' depiction of flying through Saturn's rings. I can live with it. Credit: FOX
Cosmos’ depiction of flying through Saturn’s rings. I can totally live with it. Credit: FOX

All things being equal, this was just too cool a shot to pass up, so I’m good with it.

Next was an all-too brief mention of the ice giants Uranus and Neptune. I know it’s an ambitious first episode show and there’s only so much time to devote to such things but I feel bad for those two worlds. To their credit, they took a moment to describe Trans-Neptunian Objects and the icy worlds of the Kuiper Belt, but once again they overcrowded the scene.

Asteroid belt: Not to scale (or reality) Credit: FOX
The Kuiper Belt: Not to scale (or reality) Credit: FOX

It seems that in this new sequence, we are dodging space rocks a-la the Millennium Falcon, which is unfortunate. In reality, there’s even more space between Kuiper Belt objects than there are between asteroids by virtue of the fact that the Kuiper Belt extends so much farther from the Sun than the asteroid belt. Alas, the cool shot wins out and a misconception is reinforced. Bummer.

We probably wouldn't see this either but whaddyagonnado? Credit: FOX
We probably wouldn’t see this either but whaddyagonnado? Credit: FOX

Interestingly, as Tyson leaves the Solar System, he looks back on the Oort Cloud and notes that the objects there are as far apart from one another as Earth is from Saturn. I guess that’s why he didn’t have to dodge them on the way out. My only observation here, as with any depiction of the Oort Cloud, is that at this imagined distance, the icy comets that populate the cloud are much too small to be seen; The Oort Cloud would be no more noticeable from outside the solar system than it is from our vantage point well within it. And yet there needs to be a way to visually communicate to the viewer that they’re there, so we get a delicate sphere around the Sun.

Jumping forward in the sequence, Tyson continues to define our cosmic address through our diminishing place in the Virgo Supercluster of galaxies. Whenever I see shots like this, I get goosebumps, despite having been familiar with the scale of the observable universe for most of my life. However, I’ll just note that if we really were as far out in between galaxies as depicted in the sequence, we wouldn’t  be able to discern each individual galaxy with our own eyes. Remember, each galaxy in an image like the Hubble eXtreme Deep Field is the result of 2 million seconds of exposure time – nothing our eye would ever be able to register in a glimpse, even if we were looking through the Hubble Space Telescope itself. Still…goosebumps!

It’s when we zoom out to the large scale structure of the observable universe that we finally complete our cosmic address.

The entire observable universe. Yep. Credit: FOX
The entire observable universe isn’t entirely purple. Credit: FOX

I’m not sure why they chose to represent this as purple in color, but my guess is that it was inspired by the Millennium Simulation Project, an ambitious model of the gravitational interaction of a whopping 10 billion galaxies. Here is a small piece of their result:

Image from the Millennium Simulation Project. Credit: Max Planck Institute for Astrophysics
Image from the Millennium Simulation Project. Credit: Max Planck Institute for Astrophysics

To tell the truth, I wish they had used this image instead of the one they created. Not only is it more realistic, but it makes the observable universe seem larger than it appeared in Cosmos.

When describing the history of the universe, we are (re)introduced to the analogy of an earth calendar. I always thought this was the best way to convey the  13.8 billion-year history of the universe, and the comparatively negligible length of time humans have been around to notice it, to a lay audience. Naturally, this has to start with the Big Bang which, unfortunately, cannot really be properly described even with the most sophisticated of visual effects.

Definitely not the biggest. Credit: FOX
Definitely not the biggest. Credit: FOX

Don’t get me wrong, it was a cool sequence. The problem is that you cannot really depict spacetime expanding into itself, which is what really happened (and is continuing to happen). That’s because there is no outside for the universe to expand into. Perhaps the most accurate way to depict a Big Bang is to show nothing on screen, then show “fire” everywhere. There was a 1991 documentary called The Astronomers that depicted the Big Bang exactly this way. But it’s hard to convey the idea of a massive explosion without showing something…well…exploding. Hmm…

Truth be told, I’d be ok with this had Tyson not made the statement that in the beginning the entire universe was compressed down to the size of an atom. If he had instead said it was the observable universe that was so compressed, it would have made all of the difference. Here’s why:

Most cosmologists generally believe that the universe is infinite. By that definition, it extends farther beyond the farthest points in space we can see. These farthest points define the observable universe, and Tyson makes a point of distinguishing the observable universe from the entire universe, which is infinite.

But here’s the catch – if the entire universe is infinite today, then it must have been infinite in the beginning as well.  But how can something be both infinite and compressed down to the size of an atom? It can’t, but the part that defines today’s observable universe can, with all of the points of the infinite universe beyond compressed next to it, and so on. Here’s an illustration from Edward Wright’s excellent cosmology FAQ:

The universe as it was 1 billion years after the Big Bang (left), and 13 billion years later (right). Note that the galaxies (points) do not expand. Image credit: Edward Wright
The universe as it was 1 billion years after the Big Bang (left), and 13 billion years later (right). Note that the galaxies (points) do not expand, but the spacetime in between does, carrying the galaxies away from each other. Image credit: Edward Wright

The green circle represents our observable universe, with the galaxies (dots) much closer together a billion years after the Big Bang than they are today. If we run the clock back further to the beginning, our green observable universe would be infinitesimally small, but the dots (representing the galaxies we will never see) will still go on forever.

Alas, by stating that the entire universe was compressed to the size of an atom, I think Tyson may have reinforced a major misconception.

Again, none of this is to take away from what I thought was an amazing production. And truth be told, we need Cosmos on our screens now more than ever.  Carl Sagan presented Cosmos at a time of both great exploration of our solar system and of grave danger to our home planet and to humanity’s own existence. Sagan understood that our very survival depends on humankind’s knowledge of the cosmos, and of our place in it.

Today, we find ourselves once again in peril – perhaps not from nuclear annihilation but certainly from a rapidly warming planet –  but now amid an ever-increasing wave of science denial. Denial of global warming, modern medicine, biotechnology, and of investments in research. If there was ever a time when we need to present Cosmos to a new generation, it’s now.

You can view the entire episode here. Enjoy the journey.

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9 thoughts on “Some Thoughts on Cosmos

  1. I just watched it on Monday night. I find myself somewhat conflicted about the first episode… it might take a second before I can come to any conclusions…

    Eric

      1. Well, the original Cosmos was something truly special at the time and re-capturing that may prove difficult. The commercials also were a bit of a problem for me.

        And while I really like NdGT, and only judging by the first episode, something just does not seem right. It could be the juxtaposition of the virtual set vs real world settings.. I’m just not sure…

        The animated segments also did not work for me.

        Like I said, I really need to see the next few episodes….

        E

        1. Yeah, I hear you. I have to resist the temptation to compare it to the original Cosmos and accept this new production on its own terms. I’m sure PBS would have loved to air it commercial-free but I think the strategy was to give this the widest distribution as possible and so they went on FOX (where Seth MacFarlane has a ton of clout). The result is a necessarily different show.

  2. We desperately need it now. We need something to engage the population of this country in science, the mystery and wonder of science and the truth of science. The recent article in the Huffington Post about Wyoming’s Governor and a small addendum in the budget bill regarding my promotion of the Next Generation Science Standards as Wyoming’s Science Standards serves as a beacon exposing the lack of understanding and fear of science in the USA. If this show helps get anyone reengaged in science it will have done it’s job.

  3. I personally believe that Uranus and Neptune were not more thoroughly discussed because we have yet to send a spacecraft to specifically study them. We only know a little bit about them compared to all of the others. Personally, I didn’t care for the explanation of the formation of the Moon. Overall, though, I loved it!

  4. I agree with you on the Big Bang part. I was hoping for a better depiction for it as well, but agree that it was done for a wider audience. I also caught the “whole universe” rather than “whole observable universe” line and was surprised Tyson didn’t correct it.

    I thought they would spend more time on the planets, but they just gave each a very quick look. Maybe in future episodes…

  5. Best way to describe the Big Bang, is that it was the beginning of space and time (or space-time). In other words, there is no “before” the Big Bang, as time didn’t yet exist. Time would have no meaning without change, anyway.

    But agree that there’s no good graphical way to represent it.

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