Please enable JavaScript.
Coggle requires JavaScript to display documents.
Light :bulb: (Natural Sources of Light (sun, stars, lightning,…
Light
:bulb:
Natural Sources of Light
sun
stars
lightning
bioluminescence
History of Light
First candle made in China in 200 BC with whale fat and rice paper wicks
Electric Light
1809 Humphrey Davy
Carbon strip between 2 wires connected to a battery
Electric Light Bulb
1878 Sir Joseph Swan
the carbon filament lasted 13.5 hours
Thomas Edison then removed oxygen allowing it to burn for 40 hours
Speed of light
300,000 km per second
There is 150 million km from earth to sun
Milky Way is 100,000 light years in length
Light
Light is made up of the rainbow