Origins

__Light Sources__

Light was originally a natural source produced by many things; which powers and aids many others. It's illuminating properties are so useful and necessary for the planet that it is a man-made form too.

NATURAL
Celestial and Atmospheric light:
Astronomical objects:

Sun (Sunlight (solar radiation)) - Sunset & Sunrise
Corona
Photosphere
Starlight (Stars (forming groups such as star clusters and galaxies and indirectly lighting nebulae)
Deep sky objects including quasars, Accretion discs around black holes, misc. nebulae
Supernova
Milky Way
Zodiacal light (dust in solar system)

Meteors, meteor showers
Plasma

Terrestrial:

Bioluminescence Luciferase - found in glowworms, fireflies, and certain bacteria
Aequorea victoria (a type of jellyfish)
Antarctic krill
Parchment worm
Cavitation bubbles
71 known species of luminescent fungus
Glowworm

Volcanic - Volcanic eruption (lightning, heated material)
Lava
Lava flow
Lava lake
Triboluminescence (also man-made)
Earthquake light

MAN-MADE

Direct chemical:
Chemoluminescence (Lightsticks)
Fluorescence
Phosphorescence

Combustion-based:

Candles
Flash powder
Gas lighting
Gas mantle
Kerosene lamps
Lanterns
Limelights
Oil lamps

Torches

Electric powered:
Light Bulb - in any light fixture; lamps, fairy lights, car/road association (traffic lights, hazard)
Electrical items - Fridge, cooker, washing machine, computers e.t.c.