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Physics 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. 12 billion years ago
The first galaxies begin to form, as self-contained gravitational systems with gases gradually coalescing into stars
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. 500 BC
The Greeks are intrigued by the iron-attracting property of a mineral which they find in the district of Magnesia
c. 500 BC
The Greeks observe the strange effect of electricity, seen when amber (known to them as
electron
) is rubbed
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