“The Bomb” How did the Atomic Bomb affect the world? The United States was keeping a very big secret…. This was known as the Manhattan Project “Little Boy” Height = 9ft Weight = 4 tons 8:15am “Little Boy” was dropped… Top hit 17,000 meters 300,000 degrees in the center. The fatal center widened to 500 meters Effects The bomb killed 140,000 people …almost 4 times the amount of students at UH. 65,000 were injured …over 2 times the amount of student at UH.