i only added a the and it was marked wrong "why is the sun far from the earth" I reported it.
You should read the use of 'the'
Duo's sentence is right.
What do you mean? As an english speaker 'the earth' is as fine as 'the sun'. Im not sure why earth and sun get 'the' but other planets wouldnt in this sentence, but thats English for you.
Its accepted now