Always a hoot.
— Dead & Company (@deadandcompany) November 22, 2017
Over the holidays, I decided to set up my faculty page at Towson University. I mean, now that I’ve been teaching there for a couple of years, I reckon it was about time. It’s a WordPress site and this is a WordPress site, so easy right? Um…let’s just say Towson uses a crippled version of WordPress, but I made do.
What started out as a quick and dirty project quickly evolved into two weeks’ worth of deep diving into WordPress. I’m not a PHP guy (my heart shall always belong to Lucee), but I really enjoyed learning more about child themes.
Since I promised my friends at the Westminster Astronomical Society I would revamp their website, this was my opportunity to do just that.
Being lazy, I decided to give this site a very similar treatment. I’m making use of WordPress’ TwentySeventeen theme. Granted, there are others that might be even better, but this was enough for me to learn on. I’ll probably come back and tweak a little more here and there, but the mission is accomplished. For now.
This is turning out to be an awful week for space travel. First, was the loss of an unmanned Antares rocket on Tuesday night, and today, the loss of Virgin Galactic’s SpaceShipTwo and tragically, one of her crew members. NBC News’ Alan Boyle was among the first to report on this. Here’s the key graph:
Photographer Ken Brown, who was covering the test flight, told NBC News that he saw an explosion high in the air and later came upon SpaceShipTwo debris scattered across a small area of the desert. The Mojave airport’s director, Stuart Witt, told NBC News that the craft crashed north of Mojave. He deferred further comment pending a news conference that is scheduled for 2 p.m. PT (5 p.m. ET).
It looks like we won’t know more until the news conference, and even then I expect any information will still be very preliminary. Any accident like this needs time to be investigated. But for now, there’s a brave pilot who won’t be coming home and another who will need some critical care.
I’m not going to be able to cover this story nearly as well as the local news and other outlets, so I’ll leave it to the pros. All I can say is that space travel is a very unforgiving business. The physics of it require a tremendous amount of energy to even just get into space, let alone orbit the Earth or to go beyond. Any time you try to harness that much energy there’s a potentially high price to pay when something goes wrong.
Virgin Galactic is meant to be a purely fun recreational business – an opportunity for the public to spend a few minutes in space for the cost of a $250,000 ticket. There’s no science being done, no “exploration” to speak of., and no national interest at stake And yet, it’s very much pushing humanity into a new frontier. 10 years or so ago, the idea of a private citizen purchasing a ticket for a ride into space would have been considered pure fantasy. But Virgin Galactic has gotten far closer to realizing that dream than anyone else.
They’ll recover from this and keep carrying that dream forward.
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.
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.
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…
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.
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.
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.
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.
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.
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:
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.
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 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.
We had some time to kill today, so Tom Wolf and I made a little video to explain today’s launch postponement. Since making this video, we learned that launch is GO for tomorrow, so yay! My full post is below, but in the meantime…
I woke up this morning in my hotel to a beautiful, albeit cold, morning on Chincoteague Island, VA. I glanced at my email only to discover that today’s launch had been postponed. It wasn’t a problem with the Cygnus spacecraft, nor the Antares rocket, nor (thankfully) a new problem on board the International Space Station. Everything was perfect down here on earth.
But in space, the weather was absolutely horrible. Here’s why:
Holy mother of all sunspots, Batman, those are HUGE! To give you an idea of just how large we’re talking about, let’s make a little comparison for scale:
Those sunspots are the reason for today’s postponement. Sunspots are regions of
angelic instability on the “surface” of the Sun. They mark the locations of magnetic field lines that rupture, unleashing a storm of charged particles into space at speeds of up to 2 million miles per hour. Those particles strike Earth’s magnetic field, giving us aurorae at the north and south poles:
Unfortunately, that means a lot more radiation in the near-Earth environment, and this poses a problem for launch. The Cygnus spacecraft is “hardened” against radiation, but the Antares rocket isn’t, and the launch team were concerned that it might play havoc with the rocket’s avionics, hence the postponement.
That’s a good thing, because the astronauts are still waiting for their Christmas presents.