Einstein’s role in the atomic bomb.
The world’s first detonation of a nuclear device was called Trinity, conducted on July 16, 1945, at the Alamogordo Bombing range in New Mexico, about 120 miles (193 km) south of Albuquerque. It marked the first successful test of an atomic bomb developed under the Manhattan Project in Manhattan, NYC, led by J. Robert Oppenheimer & his brother, Frank, also a physicist at Los Alamos. They were both accused of having Communist ties. Under Senator Joseph McCarthy, thousands of Americans were accused of being Communists during the Cold War period, the Oppenheimers included. He had to resign his teaching position at the University of Minnesota & could no longer work as a physicist in the U.S. He was allowed, however, to teach physics at a high school. A review by the U.S. government reversed the decision of 1954, acknowledging that the original hearing was biased & unjust.
The amount of energy released was mind-blowing, equivalent to 21,000 tons of TNT (trinitrotoluene) or 42 million lbs (19,050,875 kg). Einstein’s connection to Trinity was indirect but foundational. He didn’t work on the Manhattan Project, was not present at the Trinity test, & had no security clearance to participate. His role was catalytic, though: his 1939 letter to President Franklin D. Roosevelt, co-signed with physicist Leo Szilard, warned that Nazi Germany might develop nuclear weapons. This letter helped spur the creation of the Manhattan Project, which ultimately produced the atomic bomb. Einstein’s equation E = mc² provided the conceptual basis for understanding how small amounts of mass could be converted into enormous amounts of energy—central to nuclear fission. When the atomic bomb exploded, it created a blazing fireball 2,000 ft (610 m) in diameter.
Einstein’s famous equation E = mc² says mass (m) is just another form of energy & the two can be converted into each other. Imagine a paperclip weighs about 1 gram (0.035 oz.); if you could convert that entire gram (its mass) into pure energy, it would release about 20,000 tons of TNT—roughly the size of the Trinity explosion. The speed of light squared explains why nuclear reactions release so much energy. It explains why stars shine; they convert mass into light & heat. The speed of light is the biggest number nature gives you, about 670,000 miles per hour (300,000 km per second), and multiply that by itself. Einstein discovered that mass & energy are connected through the geometry of spacetime. In that geometry, the speed of light is the fundamental scaling factor—like the ruler the universe uses. When you convert mass to energy, you’re not measuring speed—you’re converting one kind of stuff into another. The math of spacetime says the conversion requires c multiplied by, which is why you see E = mc². If the universe used only the speed of light itself, the energy in matter would be far smaller. But experiments—nuclear reactions, particle physics, stars—show that energy released is proportional to mass x c², not mass x c. Squaring c (or the speed of light) matches what nature actually does.
Oh, and one more thing. Today is National Pi Day, 3.14. And one last connection: today marks the death of that other celebrity physicist, Stephen Hawking. I think I’ll celebrate with a delicious slice of homemade blueberry pie.
