Two of Jupiter's satellites, Europa and Ganymede, pull Io into an elliptical orbit around Jupiter. Differences in the strength of Jupiter's gravitational pull as the distance between the planet and Io varies causes slight changes in Io's shape. Scientists believe that Io heats up internally when it changes shape.
The Atomic Age, also known as the Atomic Era, is the period of history following the detonation of the first nuclear (atomic) bomb, Trinity, on July 16, 1945 during World War II.
A +A -. The Big Bang. On the morning of May 18, 1974, in the Pokharan desert, the ground shook violently as India conducted its first atomic bomb test, cloaking it as a peaceful nuclear explosion. In doing so, India became the world's sixth nuclear power after the US, Soviet Union, Britain, France and China.