Embryonic Sun Formed of a Dense Ball of Gases
Puzzle 19 of Tolkien Universe Medium Pack
Question is: Embryonic Sun Formed of a Dense Ball of Gases
and the answer is: PROTOSTAR
Word Meaning:
PROTOSTAR — (astronomy) A collection of gas and dust in space with high temperature that usually grows to the point of beginning nuclear fusion and becoming a star.
Definitions from Wiktionary.