Below you can find the In a kids' song the sun is a mass of incandescent gas...where hydrogen is built into this Jeopardy Words Answer. The answer to In a kids' song the sun is a mass of incandescent gas...where hydrogen is built into this has 6 letters. This clue belongs to the The noble gases category and is part of Jeopardy Word Level 2517. If you scroll near the bottom you will find other clues and answers part of level 2517