Hiroshima: When Science Changed the World Forever

On August 6th in Science History, one of the most significant events was the dropping of the atomic bomb on Hiroshima, Japan, in 1945 during World War II. This event, while not directly related to scientific discovery, was a result of years of scientific research and development in the field of nuclear physics.

The Manhattan Project, led by physicist J. Robert Oppenheimer, was a top-secret United States government research project that aimed to develop the first nuclear weapons during World War II. The project brought together some of the greatest scientific minds of the time, including Enrico Fermi, Richard Feynman, and many others.

On the morning of August 6, 1945, at 8:15 am local time, the first atomic bomb, nicknamed "Little Boy," was dropped from a B-29 bomber named Enola Gay over the city of Hiroshima. The bomb exploded with a force equivalent to 15,000 tons of TNT, instantly destroying nearly 90% of the city and killing an estimated 70,000 to 80,000 people. Thousands more would die in the following months and years from radiation poisoning and related illnesses.

The scientific principles behind the atomic bomb involved nuclear fission, a process in which the nucleus of an atom splits into smaller parts, releasing a tremendous amount of energy. The bomb dropped on Hiroshima used uranium-235, a rare isotope of uranium that undergoes fission more readily than the more common uranium-238.

The devastating effects of the atomic bomb on Hiroshima and, three days later, on Nagasaki, led to Japan's surrender and the end of World War II. However, the use of nuclear weapons raised serious ethical questions about the role of science in warfare and the responsibility of scientists in developing such destructive technologies.

The events of August 6, 1945, marked a turning point in human history, ushering in the atomic age and the threat of nuclear annihilation. It also served as a stark reminder of the incredible power of science and the need for responsible and ethical use of scientific knowledge.

In the years following the war, many of the scientists involved in the Manhattan Project became advocates for nuclear disarmament and the peaceful use of nuclear energy. The Bulletin of the Atomic Scientists, founded in 1945 by a group of Manhattan Project scientists, created the famous "Doomsday Clock" to symbolize the threat of global catastrophe due to nuclear weapons and other existential risks.

The legacy of the atomic bomb and the events of August 6, 1945, continue to shape our world today, influencing international relations, politics, and the ongoing debate about the role of science in society.


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Episode Transcript

Speaker 1 (00:00):
Welcome to This Moment in Science History podcast on August sixth.
In science history, one of the most significant events was
the dropping of the atomic bomb on Hiroshima, Japan, in
nineteen forty five during World War II. This event, while
not directly related to scientific discovery, was a result of
years of scientific research and development in the field of

(00:23):
nuclear physics. The Manhattan Project, led by physicist ja Robert Oppenheimer,
was a top secret United States government research project that
aimed to develop the first nuclear weapons during World War II.
The project brought together some of the greatest scientific minds
of the time, including Enrico Fermi, Richard Feynman, and many others.

(00:47):
On the morning of August sixth, nineteen forty five, at
eight fifteen am local time, the first atomic bomb, nicknamed
Little Boy, was dropped from a B twenty nine bomber
named in Nola Gay over the city of Hiroshima. The
bomb exploded with a force equivalent to fifteen thousand tons

(01:07):
of TNT, instantly destroying nearly ninety percent of the city
and killing an estimated seventy thousand to eighty thousand people.
Thousands more would die in the following months and years
from radiation, poisoning, and related illnesses. The scientific principles behind
the atomic bomb involved nuclear fission, a process in which

(01:28):
the nucleus of an atom splits into smaller parts, releasing
a tremendous amount of energy. The bomb dropped on Hiroshima
used uranium DASH two hundred thirty five, a rare isotope
of uranium that undergoes fission more readily than the more
common uranium DASH two hundred thirty eight. The devastating effects
of the atomic bomb on Hiroshima and three days later

(01:51):
on Nagasaki led to Japan's surrender and the end of
World War II. However, the use of nuclear weapons raised
serious ethical questions about the role of science and warfare,
and the responsibility of scientists in developing such destructive technologies.
The events of August sixth, nineteen forty five marked a
turning point in human history, ushering in the atomic age

(02:14):
and the threat of nuclear annihilation. It also served as
a stark reminder of the incredible power of science and
the need for responsible and ethical use of scientific knowledge.
In the years following the war, many of the scientists
involved in the Manhattan Project became advocates for nuclear disarmament
and the peaceful use of nuclear energy. The Bulletin of

(02:35):
the Atomic Scientists, founded in nineteen forty five by a
group of Manhattan Project scientists, created the famous doomsday clock
to symbolize the threat of global catastrophe due to nuclear
weapons and other existential risks. The legacy of the atomic
bomb and the events of August sixth, nineteen forty five
continued to shape our world today, influencing international relations, politics,

(02:59):
and the other ongoing debate about the role of science
in society. And that wraps it up for another episode.
Please subscribe and join us tomorrow for another great moment
in science. This has been a Quiet Please Studios Production.
For more check out Quiet Please dot Ai. Thank you
for listening.