Definition: You will be given three sentences. Read them, then identify a noun phrase (person, place, or thing) or event that is shared between all three sentences. As the output, write the span of the text corresponding to that phrase in each sentence. Keep the order of the sentences, that is, your answer should look like: 1: *a phras from sentence 1e* 2: *a phras from sentence 2* 3: *a phrase from sentence 3*
Input: 1: The devastating event took place on our planet many millions of years ago , but researchers are only now beginning to discover what happened . 2: In a remote part of Central Australia , the two pieces of asteroid left what geophysicists say is the largest impact zone ever found on Earth , spreading over an area 400 kilometers ( 250 miles ) wide . 3: Two pieces of asteroid crashed into Australia many millions of years ago .

1: The devastating event 2: the two pieces of asteroid 3: asteroid