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A Celebration of Light
Light comes from many processes: incandescence (heat makes things glow), luminescence (chemical or electrical excitation), nuclear reactions (the sun), and the mysterious process of bioluminescence (living light).
The star that sustains all life on Earth, a ball of plasma 1.4 million km wide
Mechanism: Nuclear fusion, 5,500°C surface
Humanity's companion through countless dark nights
Mechanism: Combustion, about 1,000°C flame
The sky's sudden declaration, 30,000 Kelvin hot
Mechanism: Electrical discharge
Living lanterns signaling in summer darkness
Mechanism: Bioluminescence, chemical reaction
Curtains of color at the poles
Mechanism: Solar wind exciting atmospheric gases
Distant suns, some already dead when their light reaches us
Mechanism: Nuclear fusion
Borrowed light, the sun's reflection
Mechanism: Reflected sunlight
Humanity's first tamed light
Mechanism: Combustion and incandescence
Coherent light amplified and focused
Mechanism: Stimulated emission
The future of illumination
Mechanism: Electroluminescence
The glow of city nights
Mechanism: Gas discharge
Light that lingers after the source is gone
Mechanism: Stored energy slowly released
Lights in the eternal darkness
Mechanism: Bioluminescence
Living constellations in caves
Mechanism: Bioluminescence
The light that powers stars
Mechanism: Matter converting to energy
Humanity has harnessed light for countless purposes:
Light carrying data through glass threads, the backbone of the internet
Plants converting sunlight to food, the basis of nearly all life
Laser scalpels cutting with precision, cauterizing as they go
Photovoltaic cells turning photons into electricity
Light revealing the invisible, from cells to atoms
Ancient light telling us the universe's story
Capturing moments as frozen light
Reading the fingerprints of elements in starlight
Laser pulses mapping terrain and detecting obstacles
Three-dimensional images stored in interference patterns
Light treating jaundice, depression, skin conditions
Light processing information faster than electrons