Which of the following could be known by direct observation?

A) the mass of the sun
B) how the sun produces heat and light
C) the sun's chemical make-up
D) the color of the sun
E) the age of the sun

Direct Observation

A research method involving the direct and unobtrusive observation of individuals or phenomena in their natural setting.

Chemical Make-up

Refers to the composition of a substance, detailing its various chemical elements and compounds.

Produces Heat

A process or object that generates thermal energy.