radiation
Technically, this answer is true -- LASER burns are "radiation" burns, most frequently in the visual light or infra-red parts of the EM spectrum. However, we tend to associate the term...
I think that you may have meant to ask the "When does your body burn fat and when does it burn muscle?" rather than the question that you actually asked. However, if you did intend to ask about the...
The Sun will not "burn out" like a wood fire might; instead, near the end of its life, the Sun will expand into a red giant star, and will expand so much that it will engulf the planets Mercury and...