Given the task definition and input, reply with output. Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Context: When the series was revisited for the 10 year anniversary, both Northstar and Aurora are later killed by Weapon X (Wolverine) and Kirika (X-23 in the main Marvel Universe).
Question: Which fictional universe is Northstar from?
marvel universe