The Sun.
the sun is the primary source of light
sun is the primary source of heat and light......
A letter is a primary source.
The sun is the primary source of light for Saturn.
The primary light source is the sun for the planet Earth.
Yes. The primary source.
because its main source that gives it to light is one of the main source of light
it is a primary source because it wasnt real
The Sun
our primary source comes from the sun.
Original letters or documents, for example. A secondary source would be an essay, for example, about the original source.
Diaries