These hydrogen atoms can come together in nuclear processes called fusion, which is the process that powers the sun, and through fusion, heavier atoms such as carbon and nitrogen are produced. These in turn undergo fusion to make even heavier atoms, and it is such processes that created all the atoms in the earth.
Earth formed from debris orbiting around our sun about 4 billion years ago. That is also the guessed age of the sun. The story really begins with the Big Bang nearly 14 billion years ago, which spewed hydrogen atoms throughout the universe
