Review: "Death by Black Hole" — Why We Should Look Up at the Universe Right Now
Annotations on Neil deGrasse Tyson's book — America's most beloved astrophysicist. Notes on sense perception, physical laws, and the limits of what we know.
Neil deGrasse Tyson — America's most beloved astrophysicist.
Death by Black Hole contains 42 essays originally published in Natural History, the magazine of the American Museum of Natural History. It runs 496 pages and is full of passages worth stopping to think about.
My annotations on Part I: "What Is Known" — five essays across five chapters.
Chapter 1: The Cosmic Perspective
Human senses don't always perceive accurately. We tend to receive external stimuli logarithmically, not linearly. If you increase the energy (volume) of a sound tenfold, our ears don't hear it as ten times louder — just "a bit louder."
Note. The limits of perception are hard to recognize without intentional reflection. This is partly protective, but it also means that scientific understanding requires keeping a spirit of "doubt" in mind.
Modern physics tells us that truths exist beyond human senses, and that truths far more valuable than the most prized discoveries of our empirical world are colliding and generating all manner of problems out there. — Max Planck
Note. Planck was a German physicist who studied thermodynamics and discovered Planck's constant, foundational to quantum mechanics. He argued that physics approaches nature through philosophical thinking, not in opposition to it.
Chapter 2: On Earth as in the Heavens
The Voyager probes carry recordings of human heartbeats, whale songs, and music ranging from Beethoven to Chuck Berry. The 1970s were a romantic age — even the spacecraft had a name like "Pioneer."
Physical laws are valid only within the domains where they have been verified. Since physical laws operate universally, scientists consider the universe to be a very simple thing.
Note. Understanding the universe isn't about going there to see, hear, and taste it with our senses — that necessarily involves distortion. Instead, physicists understand the universe through perfect laws. This may resemble how future AI understands the world: by learning rules through data and using those rules as a lens.
Chapter 3: One Voice in the Cosmic Fugue
Edwin Hubble calculated in October 1923 that the Andromeda galaxy is about 2 million light-years from Earth. Earth is not the center of the universe; our galaxy is not the only galaxy.
Note. Proving that we are not the center of the universe is enormously important. The Ptolemaic system was accepted for so long, and religion resisted heliocentrism, because accepting that we are not the protagonist is hard. When you're not at the center but at the periphery — can you still make peace with yourself?
The book rewards slow reading. Tyson makes the case that cultivating romantic curiosity about the universe — not just its industrial value — is what ultimately expands the horizon of human imagination.