2015;
371 pages. Full Title: Dark Matter and the Dinosaurs – The Astounding
Interconnectedness of the Universe.
New Author? : Yes. Genres : Paleontology;
Astrophysics; Quantum Physics; Science; Non-Fiction. Overall Rating : 9*/10.
Dinosaurs! Everybody, be they child or adult, is fascinated by them. They dominated the earth for an astounding
165 million years - from 231 million to 66 million years ago - meaning, as one
meme has put it, that Tyrannosaurus Rex was closer in time to listening to Justin
Bieber than in meeting up with a Stegosaurus.
Everyone
knows that around 66 million years ago, something happened in a flash (which in
paleontological terms means a million years or so) and 75% of all
life on Earth perished, including all dinosaurs that couldn’t fly or burrow
into the ground. This is called “The Fifth Extinction”.
But what
caused this immense dying-off? Well, when I was
a kid, the prevailing theory was that climate change was the culprit – the
inland seas dried up, the Earth was subject to global warming, and the
dinosaurs couldn’t cope with the new conditions.
Then in
the 1980s, that hypothesis gave way to the proposition that a giant meteoroid
slammed into the Earth and wreaked cataclysmic destruction. That theory gained traction when an
appropriately sized and appropriately timed impact crater was found off the
Yucatan coast in Mexico.
Lisa
Randall now adds a new twist to that scenario in the form of the inscrutable essence
called “dark matter”. It can’t be seen,
touched, felt, or measured, yet it penetrates and permeates everything in the universe without
have any effect, save for a faint gravitational influence.
Well
that’s all fine and dandy, but what sort of evidence can she produce to support
such a wild and wacky theory? Let’s read Dark Matter and the Dinosaurs and find out.
What’s To Like...
The central hypothesis of Dark Matter and the Dinosaurs is given in its introduction: the Solar System periodically passes through the midpoint of the
galactic plane, wherein lurks a dense disk of dark matter. The gravitational pull from that disk is
strong enough to dislodge a flurry of comets from something called the Oort
cloud, sending them into random new orbits, one of which impacted the Earth,
wiping out the dinosaurs, and allowing mammals, then eventually homo sapiens, to flourish and dominate.
The
book is divided into three parts. Chapters 1-5 covers the birth of the Universe
itself, from a microsecond after the Big Bang through the time when galaxies
and individual stars are created. Chapters 6-15 focuses on the emergence of
our Solar
System, with special attention on comets and asteroids. Chapters
16-21 then shows how Dark Matter could affect all of this, plus how scientists might detect and confirm its influence.
The
book is a cosmological delight. If
you’re interested in, but have never understood the whole concept of Dark
Matter (that's me!) , this book will bring you enlightenment. Moreover, I
was impressed by the attention paid to the Kuiper belt and the Oort cloud,
both parts of the Solar System that most people have never heard of. And I was surprised to learn that the Universe,
the Milky Way, and our own Solar System are all pretty much “flat”, and
why this is so.
I
enjoyed meeting Fritz Zwicky, who first proposed the existence of Dark Matter, and Fred Whipple (not the guy who squeezes the Charmin),
who first called comets “dirty snowballs”.
I also learned why meteor craters, both on the Earth and the Moon are
almost perfectly round, when you’d think they’d be off-center since whatever
caused them is coming in at an angle.
I
laughed at some of the acronyms in the book.
There are “Squids” (Superconducting Quantum Interfering Devices),
“Machos” (Massive
Compact Halo Objects), “Wimps” (Weakly Interfering Massive Particles), and
the mind-boggling “Edelweiss” (Expérience Pour Détecter les Wimps en Site Souterrain).
It was kewl to see Arizona’s Meteor
Crater get some ink, ditto for my alma mater Arizona State University, and
weird to see Chelyabinsk mentioned, since this is the second book I’ve read
this year that featured it.
Kewlest New Word ...
Putative (adj.)
: generally considered or reputed to be true.
Others: Conflated
(v.).
Excerpts...
The Milky Way
galaxy is in a group of galaxies known as the Local Group, which is a
gravitationally bound system of galaxies whose density is higher than
average. The Milky Way and the Andromeda
galaxy, also known as M31, dominate the group’s mass, but dozens of smaller
galaxies belong to the group too – mostly satellites of the two bigger
ones. The gravitational binding force of
the Local Group prevents the Milky Way and Andromeda from receding from each
other with the Hubble expansion. Their
paths are actually converging and in about four billion years they will collide
and merge. (loc. 1441)
In the early
1950s, Stanley Miller and Harold Urey at the University of Chicago did a famous
experiment in which they heated a flask of water that was enclosed by a
container filled with methane, ammonia, and hydrogen. Their goal was to mimic the primordial ocean
in the early atmosphere. An electrical discharge
acting on the water vapor played the role of lightning in their artificially
created “atmosphere”. Miller and Urey
successfully produced amino acids with their simple apparatus, demonstrating
that the production of amino acids in solar and extra-solar environments is
actually no so surprising. (loc.
3720)
Kindle Details…
Dark Matter and the Dinosaurs is presently discounted
at Amazon, going for the awesome price of only $1.99. Lisa Randall has four other science e-books
available, ranging in price from $7.49 to $9.99.
“All science is either physics or stamp collecting.” (Lord
Rutherford) (loc.
3927 )
For me, Dark Matter and the Dinosaurs was a fascinating
book, but reading Lisa Randall’s technical justifications for her
hypothesis can be brain-numbing, particularly the sections involving Quantum
Physics. Trying to comprehend the
various “darks”: Dark
Matter, Black Holes, Dark Energy, Anti-Dark Matter, Partially Interacting Dark
Matter, Double-Disk Dark Matter, and Dark Disk Gravity, was also quite the
challenge. Many nights, after 15-30 minutes of reading this book, I was ready to switch to reading something more relaxing.
I
don’t think this is in any way a fault on the author's part.
Lisa Randall is proposing something radically new here, and her
readers are going to range from a.)
other astrophysicists, b.)
other scientists (like
me), and c.) people without a technical background. If she
solely caters to any one of those groups, the other two will be sorely
disappointed. Her astrophysicists colleagues will be particularly nitpicky when looking for holes in her analysis. You can’t please
everybody, but she does a good job in trying.
Overall
I found Dark Matter and the Dinosaurs
to be a challenging, fascinating, and enlightening read. In addition to learning a ton of stuff about
Dark Matter, I was especially delighted by the attention given to the Oort
cloud and the Kuiper Belt. Yes, I got
lost a lot in the quantum physics chapters.
But a little bit of mental calisthenics is good for the gray matter.
9 Stars. We’ll close with a brain teaser. Suppose scientists detect a huge “Near Earth
Object”, still weeks away, but headed for a crash landing on Earth.
What is our best strategy to deal with it:
a.) try to blow it up,
b.) try to deflect it by pushing it sideways, or
c.) something else?
a.) try to blow it up,
b.) try to deflect it by pushing it sideways, or
c.) something else?
Answer in the comments.
