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Science timeline
c. 13.7 billion years ago
Big Bang, an unimaginably large explosion from an unimaginably small particle - according to modern theory the first moment of the universe
c. 13.7 billion years ago
Hydrogen and helium nuclei form in the first three minutes, with perhaps another 300,000 years before they combine with electrons to form atoms
c. 13 billion years ago
As gravity exerts its pressure within parts of the expanding fireball, subnuclear particles merge into more complex elements
c. 4.6 billion years ago
A new galaxy, the Milky Way, forms - and one of its stars is our sun
c. 4.6 billion years ago
The new star settles down, while nuclear dust in the vicinity coalesces into planets and asteroids orbiting the sun
c. 4.5 billion years ago
The earth condenses into a solid sphere, with an inner core which is extremely dense and hot
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