Give yourself to the Dark Side. It is the only way you can save your friends. – D. Vader
Lisa Randall, a Harvard Science professor, member of the National Academy of Sciences, named one of the 100 Most Influential People by Time Magazine in 2007, and author of three previous books, likes to think big. She also likes to think small. Her areas of expertise are particle physics and cosmology, which certainly covers a range. The big look she offers here is a cosmological take on not only how it came to pass that a large incoming did in the dinosaurs 66 million years ago, but why such decimations of life on Earth arrive with some (on a cosmological scale) regularity. Her explanation has to do with dark matter. It makes for an interesting tale, and offers an excellent example of how the scientific method (how Daniel Day Louis might play Louis Pasteur?) approaches problem-solving. It is a fascinating read that is at times wondrously accessible and at others like trying to bat away a swarm of meteoroids.
As with most good communicators of science. Randall relies on metaphor, and some of hers are quite good. My favorite compared methods of detecting dark matter to detecting the presence of [insert name of your favorite A-list celebrity here]. You can tell that there is something going on, without actually having to see the celebrity, because you can see swarms, gaggles, pods and packs of paparazzi clumping around the object of their lenses as he/she/it walks/primps/flees down the street. Dark matter affects the things around it too, and it is by measuring those effects that we can tell it is there, even though it remains…you know…dark.
She addresses some cosmological questions and offers up the answers that the best current theories provide. One example is that the rotational velocity of stars should be sufficient to make them literally spin out of their galaxies, and yet they don’t. Something must be keeping them in place. Care to guess? There are more like this. They vary in Wow-Cool! levels. Randall takes us from a look at how we know dark matter is out there, and its characteristics, to an overview of our solar system. This is more interesting than a science class slide show of the 8 (or 9 if you are my age) planets circling around our sun. (Well, maybe I should say your sun, but I don’t really want to get into that) There is a lot of other material cruising around out there, and it is significant, as in Please, oh please, do not come crashing into our planet, pretty please.
Path of the New Horizons spacecraft into the Kuiper Belt – from NASA
The Kuiper Belt, a group of clumped asteroids, not an award for the baddest Kuiper, and the Oort Cloud (not where Obchestvo Remeslenogo Truda keeps its data) for example, are parts of our solar system, and move through inter-stellar space along with the sun and planets.
The Oort Cloud – From NASA
You might think of the sundry members of the Solar System as a family all stuffed into one very, very large car of the Wonder Wheel in Coney Island. Once everyone is in, the whole crew moves through space (or circle in this instance) as one. But what if there were another Wonder Wheel, one that was made, not of the dense ordinary matter, but of the much thinner dark sort. Let’s say that it is not vertical but does its spinning thing at an angle. And let’s say it intersected our Wonder Wheel at one point. And every so often, say every thirty some odd million years, the car our solar system is in intersects the material in that other Wonder Wheel. The result could be unpleasant. The big stuff would probably be ok, our sun, the planets, but some of the smaller bits, say rocks in the Oort cloud and Kuiper Belt, might get knocked out of their usual paths. And voila! Fireworks! Big incomings headed our way yet again.
Well, that’s the scoop. I am not giving anything away by laying it out. The value of the book lies in showing how theories are examined, tested and accepted or discarded, the scientific method in action.
But I would not want to make you think the orbit you take while reading Dark Matter and the Dinosaurs is all clear sailing. There are incomings you have to contend with. It is always takes a bit more effort to absorb material when much of it is new to the reader, particularly when there are many new words, acronyms and concepts being thrown at you. I confess that there were points in reading this book when my eyes glazed over. It felt like I was reading a list in a foreign language. My mind went a bit dark in the chapter on how galaxies are born and in a couple of particle physics chapters near the end. On the other hand, enough of the early discussion of dark matter was utterly fascinating. When Randall writes of a second, post-Big-Bang expansion of the universe, it was news to me. I quite enjoyed the tour through our solar system, one that included parts we do not usually think of. And if you ever wondered about how three words are used, the answer is here. Meteors are what we see streaking across the sky. We call them meteoroids if they make it to the ground. (I hereby promise that no meteor will touch the Earth on my watch) In fact any alien object hitting Earth is a meteoroid. (Even Asgardians?) Meteorites are the detritus of meteoroid impact. There is a nifty piece on how we define what is and is not a planet, and some amazing intel on what unexpected materials asteroids and comets might have brought to the Earth over the history of our planet, and another piece on how craters are created. And did you know that there is a multi-national (as in countries not corporations) organization that was set up to watch the skies for the next big thing? These and more such nuggets make the journey with Randall worth the occasional eye-glaze.
And if you are worried about The Big One wiping us out, don’t. We will see to that ourselves long before a big rock does the job for us. The current rate of species extinction is comparable to the one that took place 250 million years ago, the Permian-Triassic extinction. In that one 90% of species were wiped out, including insects. There is always hope that we will, over a period of millions of years, figure out how to keep large floaters from making a mess of our earthly garden. With Dark Matter and the Dinosaurs Lisa Randall, by striving to gain greater understanding of how the universe works, is doing her bit to shine a light in the darkness.
Review posted – 10/30/15
Publication date – 10/27/15
Links to the author’s Twitter and FB pages
NASA’s Site about the Kuiper Belt
In 2010, the National Academy of Sciences presented their results on asteroids and the threats they pose in a document entitled Defending Planet Earth: Near-Earth Object Surveys and Hazard Mitigation Strategies
A nice article in the June 2013 Smithsonian – Lisa Randall’s Guide to the Galaxy
An interesting set of videos with Randall on BIG thoughts
Although the interview is for a different book, Randall’s Daily Show interviewwith Jon Stewart is fun and informative re things scientific.
Ditto, as Randall is interviewed by Tavis Smiley
A nifty set of videos on the hazards presented by asteroids
The Dark Song from The Lego Movie – It’s Awesome