Compléter Universe timelineVersion en ligne Fill in the timeline of the universe to the best of your ability. par Krisanne Lamb 1 atomic galaxies stars minutes Hydrogen heavy Three 000°c second One helium planetary 10 protons die electrons after the Big Bang , the universe was as hot as 10^27°c . after the Big Bang , the universe cooled to 1 billion degrees . Charged and began to form along with neuclei . 370 , 000 years after the Big Bang , the universe cooled to , . and began to form . 1 billion years after the Big Bang , hydrogen and helium clouds began to collapse onto themselves , creating and the universe's first . 10 billion years after the Big Bang , stars began to , spilling elements into space . These elements formed systems . The universe cooled to - 270°c .