Is this correct:
When we heard the news about the landslide we headed over quickly.
Or do I need a comma after "the landslide"? If so why?
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You need to learn to use capital letters. Sentences must start with a capital letter.
Apart from that, your sentence is correct. It could benefit from a comma, which would serve to indicate the natural division into the two clauses. In speech this would be marked by a significant intonation change (falling on "landslide" then high again on "we headed"). Both "when" and "if" clauses are ended by a comma when they are not at the end of a sentence.