Both the earth and the moon do not shine by their own light.
Both the earth and the moon do not shine by their own lights.
I can't decide whether the word light is "countable or uncountable" in this sentence.
singular-vs-plural
Both the earth and the moon do not shine by their own light.
Both the earth and the moon do not shine by their own lights.
I can't decide whether the word light is "countable or uncountable" in this sentence.
Best Answer
The singular
is appropriate since
also
In your example, own refers to earth and moon and if illuminated would have one source of light.