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.
It wasnât until well. into the 20th century that enough. information had accumulated about the. rate of radioactive decay that the age of. rocks and fossils in number of years could. be determined through radiometric age. dating or absolute age dating. This packet on determining age of rocks.