An uncertain color (from the beginning to the year 1000) : Did the Greeks see green? ; Green among the romans ; The emerald and the leek ; Hippodrome green ; The silences of the Bible and the church ...
Some rare galaxies, like NGC 5972 shown here, exhibit a green glow thanks to the presence of doubly ionized oxygen. This requires UV light from stellar temperatures of 50,000 K and above. Oxygen is ...
When we view deep-space objects through backyard telescopes, we typically don’t see much color. The big exception is the bright green in certain nebulae. The secret behind this color constitutes a ...
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