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21 Facts About the Atomic Bombs on Hiroshima & Nagasaki

21 Facts About the Atomic Bombs on Hiroshima & Nagasaki

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In October 2024, a Japanese group of atomic bomb survivors won the Nobel Peace Prize. Take a minute to imagine what these resilient humans actually survived. Just after 8 in the morning on August 6, 1945, an atomic bomb was dropped on Hiroshima. It was nicknamed “Little Boy,” but there was nothing little about it.

The bomb reduced 5 square miles of the city to dust. Three days later, another atomic bomb, nicknamed “Fat Man”, was dropped over Nagasaki. These events ended the six-year World War II and started a new, painful chapter for Japan.

What do you know about these disasters, arguably the most extensive bombings in the history of civilization? Here are 21 interesting facts about these devastating historical events.

1. They Vaporized Everything in Their Path

Atomic cloud over Nagasaki from Koyagi-jima
Photo Credit: Hiromichi Matsuda – Public Domain/Wiki Commons.

When the atomic bombs detonated over Hiroshima and Nagasaki, the sheer heat and pressure caused buildings, people, and the upper layer of the Earth to vaporize instantly. Winds reached speeds of up to 600 miles per hour, devastating everything in their path.

The vaporization and immense force of the explosion left behind nothing but rubble and desolation. Trees, buildings, and human life were obliterated, creating a haunting and barren landscape.

2. Mid-Air Detonation Reduced Fallout

Battered religious figures stand watch on a hill above a tattered valley. Nagasaki, Japan. September 24, 1945, 6 weeks after the city was destroyed by the world's second atomic bomb attack.
Photo Credit: Cpl. Lynn P. Walker, Jr. – Public Domain/Wiki Commons.

Both atomic bombs exploded in mid-air before reaching the ground, which reduced the level of radioactive fallout compared to ground detonations. Scientists suggest that this may be why Hiroshima and Nagasaki are no longer dangerously radioactive today.

The bombs’ airborne detonations were designed to maximize the blast’s damage over a wider area while minimizing long-term radioactive contamination, though the devastation was still immense.

3. Radiation Killed Thousands Post-Blast

Mother and daughter damaged by atomic bomb lying down in Hiroshima Ohshiba Primary School - 11 October 1945
Photo Credit: Kikuchi Shunkichi – Public Domain/Wiki Commons.

The bomb dropped on Hiroshima killed around 78,000 people instantly and about 120,000 in the following four days. In the weeks that followed, thousands more succumbed to radiation poisoning, which caused severe burns, organ failure, and lingering health issues.

Radiation exposure continued to affect survivors long after the initial blasts, leading to long-term illnesses such as cancer, genetic mutations, and various chronic diseases.

4. Nagasaki Wasn’t the Original Target

Dan A McGovern at Nagasaki ground zero 9September 1945
Photo Credit: US Federal Govt – Public Domain/Wiki Commons.

Nagasaki was not on the U.S.’s initial list of targets. Kokura, a cultural city, was initially considered. However, the weather conditions and cloud cover over Kokura reduced the visibility, making it hard to detonate the bombs.

As a result, Nagasaki became the unfortunate choice. The destruction of Nagasaki was immense, even though it wasn’t the intended target.

5. Hiroshima’s Military Importance

Hifuku-shishō 1944
Photo Credit: Unknown author – Public Domain/Wiki Commons.

Hiroshima was targeted for its significant military value, housing ammunition factories, military bases, and other war-related infrastructure. Its strategic importance made it a primary target for the U.S.

The bombing of Hiroshima was intended to cripple Japan’s military capabilities while delivering a psychological blow to the nation’s resolve.

6. The “Hiroshima Shadows” Phenomenon

Human shadow on stone by atomic bombing on Hiroshima - Sumitomo Bank, Hiroshima branch - around December 1946
Photo Credit: Matsuhige Yoshito – Public Domain/Wiki Commons.

One haunting outcome of the atomic bombing was the discovery of “Hiroshima Shadows,” eerie imprints of people and objects that were left scorched into the streets and buildings after the blast.

These shadows were a result of the intense heat from the explosion, which bleached the surrounding areas, leaving darker outlines of where people and objects once stood.

7. Surface Temperatures Reached 3,000 Degrees Celsius

Atomic cloud over Hiroshima, taken from Enola Gay flying over Matsuyama, Shikoku
Photo Credit: 509th Operations Group – Public Domain/Wiki Commons.

The atomic explosions produced surface temperatures up to 3,000 degrees Celsius. This extreme heat caused immediate death to those within the blast radius and ignited fires across the affected cities.

The temperature was so intense that it melted steel, glass, and other materials. This added to the destruction and made rescue efforts nearly impossible in the aftermath.

8. One Man Survived BOTH Bombings

Atomic Bomb Memorial Mound in Hiroshima
Photo Credit: Depositphotos.com.

Tsutomu Yamaguchi survived both the Hiroshima and Nagasaki bombings. He was in Hiroshima on a business trip during the first bombing and then, despite his injuries, traveled home to Nagasaki just in time to experience the second blast.

Yamaguchi’s story of survival is a remarkable and tragic testament to the horrors of nuclear warfare. He became an advocate for peace, sharing his experiences in the hope of preventing future use of nuclear weapons. He died of stomach cancer in 2010 at 93.

9. A Movie Inspired The Bombs’ Code-Names

Promotional still from the 1941 film The Maltese Falcon, published on page 12 of National Board of Review Magazine. L-R Humphrey Bogart, Mary Astor, Barton MacLane, Peter Lorre, Ward Bond
Photo Credit: Warner Bros. – Public Domain/Wiki Commons.

The bombs dropped on Hiroshima and Nagasaki were given the code names “Little Boy” and “Fat Man,” respectively. Characters inspired the names in the 1941 film The Maltese Falcon.

These innocuous-sounding names belied the devastating power of the bombs, which killed tens of thousands of people and changed the course of history.

10. Tokyo Firebombing Was Deadlier

World War II
Photo Credit: Depositphotos.com.

Though the bombings of Hiroshima and Nagasaki were devastating, the firebombing of Tokyo in 1945 was actually the deadliest air raid during World War II, killing over 100,000 people in a single night.

The firebombing destroyed large parts of Tokyo and caused mass civilian casualties. It demonstrates the horrific power of conventional weapons in the final stages of the war.

11. Soviet Union’s Role in Japan’s Surrender

Pacific Fleet marines are hoisting the banner in Port-Artur. WWII (1941-1945). Photo made on August 25, 1945.
Photo Credit: RIA Novosti archive – CC BY-SA 3.0/Wiki Commons.

Although the atomic bombings are commonly believed to have ended the war, some historians argue that Japan’s surrender was largely influenced by the Soviet Union’s entry into the war in August 1945.

The Soviet invasion of Japanese-held Manchuria added pressure on Japan. This contributed to its decision to surrender alongside the atomic bombings.

12. The Oleander Flower

Pink flowers of oleander in summer day
Photo Credit: Depositphotos.com.

After the bombing, it was said that nothing would grow in Hiroshima for 75 years. Months after the bombing, the Oleander flower bloomed out of the radioactive area. As it was the first flower to bloom after the bombing, it became the symbol of Hiroshima’s recovery.

Despite the destruction, the flower symbolized hope and renewal for the city’s survivors. Today, the Oleander remains Hiroshima’s official flower and serves as a powerful symbol of the city’s resilience and desire for peace.

13. The Peace Flame in Hiroshima

President Barack Obama and Prime Minister Shinzo Abe of Japan participate in a wreath laying at the Flame of Peace (Hiroshima) in Hiroshima, Japan, May 27, 2016. (Official White House.
Photo Credit: Pete Souza – Public Domain/Wiki Commons.

In 1964, the city of Hiroshima lit a “Peace Flame” in its Peace Memorial Park. This flame has burned continuously ever since and will remain lit until the world is free of nuclear weapons.

The Peace Flame symbolizes global efforts to eliminate nuclear arms and prevent another atomic bombing from ever happening again.

14. The U.S. Dropped Pamphlets Before the Bombings

A leaflet dropped from a B-29 on Japan after the bombing of Hiroshima.
Photo Credit: Mark Pellegrini – Public Domain/Wiki Commons.

Before the atomic bombings, the U.S. military dropped pamphlets over Japanese cities, warning civilians of “utter destruction” and encouraging them to evacuate. However, these pamphlets didn’t specify Hiroshima or Nagasaki as targets.

The warnings were vague, and many civilians did not flee in time. The bombings still caught most residents by surprise, leading to massive loss of life.

15. Hiroshima’s Sadako Sasaki and a Thousand Origami Cranes

Sadako Sasaki in a festive dress.
Photo Credit: Unknown author – Public Domain/Wiki Commons.

Sadako Sasaki was a young girl who survived the Hiroshima bombing but later developed leukemia due to radiation exposure. While in the hospital, she attempted to fold 1,000 paper cranes in the hope that it would grant her a wish for recovery.

Sadako’s story became a symbol of peace, and her legacy lives on in memorials and peace efforts around the world, with children continuing to fold cranes in her honor. Her wish may not have been granted, but we’re here reading about her, arent we?

16. Hiroshima’s Ginkgo Trees Survived the Bombing

A-bombed tree (ginkgo), Shukkei-en Garden, Hiroshima. The recognition number by Hiroshima City E13a25-01.
Photo Credit: かるちる – CC0/Wiki Commons.

Despite the widespread destruction, some trees in Hiroshima managed to survive the atomic bombing. Among them were six ginkgo trees, also known as “atomic-bombed trees.”

These ginkgo trees continue to grow and serve as a symbol of resilience and hope for the city and its inhabitants. Many people make sure to visit these trees on their trip to Hiroshima.

17. Japanese Radar Detected the Planes, but No One Acted

Radar Plotting Room of the 305th FCS, Camp Bishigawa, Okinawa, Japan 1945
Photo Credit: 305th FCS – Public Domain/Wiki Commons.

On the morning of August 6th, Japanese radar detected the incoming American planes. However, their high altitude and the small number of aircraft led to the perception of no threat. Consequently, no air raid sirens were activated, nor was any anti-aircraft fire deployed.

The bombers reached Hiroshima unopposed, enabling them to release their deadly payload without hindrance. This communication breakdown is often cited as a factor contributing to the tragic death toll in Hiroshima.

18. Japan’s Radiation Survivors Are Called Hibakusha

Terumi Tanaka, a survivor of the US atomic bombing of Nagasaki, speaks at an ICAN event in Hiroshima in 2011
Photo Credit: TimMilesWright – CC0/Wiki Commons.

Survivors of the atomic bombings are referred to as “hibakusha,” a term meaning “bomb-affected people.” These individuals have faced lifelong health challenges including radiation-related illnesses and many suffered discrimination due to fears of contamination.

There are about 106,000 hibakusha alive today. They continue to advocate for nuclear disarmament and share their stories as a warning to future generations about the horrors of nuclear warfare.

19. The “Black Rain” Phenomenon

Black Rain
Photo Credit: Nayandiniii – CC BY-SA 4.0/Wiki Commons.

One of the lesser-known impacts of the atomic bombings was the “black rain“, a phenomenon that occurred after the explosions, causing black soot-like particles to fall from the sky.

These particles were radioactive and caused further contamination and health issues for those who came into contact with them. The lack of knowledge about radiation at the time meant that many people unknowingly ingested these harmful particles.

20. The Hiroshima Prefectural Industrial Promotion Hall Survived the Blast

The Atomic Dome, ex Hiroshima Industrial Promotion Hall, destroyed by the first atomic bombing
Photo Credit: Depositphotos.com.

The Hiroshima Prefectural Industrial Promotion Hall was one of the few buildings to survive the atomic bombing. This building, now known as the “A-Bomb Dome,” remains standing as a reminder of the devastation caused by nuclear weapons.

Today, it is designated as a UNESCO World Heritage Site and serves as a symbol of peace and remembrance for those who lost their lives in Hiroshima.

21. It’s Effects Were Felt For Years

Comforting Hand
Photo Credit: Depositphotos.com.

The atomic bombings of Hiroshima and Nagasaki not only caused immediate destruction but also had long-term effects on the environment and health of survivors. To this day, there are still higher rates of cancer and other radiation-related illnesses among hibakusha.

The bombings also led to genetic mutations in plants and animals, further highlighting the lasting impact of nuclear weapons on the world.

Source

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I’m a Language and Literary Studies (Honors) graduate with 11 years of experience in magazine and blog writing and content creation. I’m passionate about storytelling for change and believe in the power of words to make a difference. My writing is thought-provoking, accessible, and engaging, focusing on the Psychology of human behavior, complex social issues, personal experiences, and the latest trends. I’m a wife and a Mom of three.

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