Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: NASA's Departing Chief Defends Hubble Decision (Reuters) Reuters - NASA's departing chief, Sean\O'Keefe, on Friday defended his decision to pursue a robotic\repair mission to the Hubble Space Telescope, days after a\panel of scientists said a shuttle mission would be better.

Sci/Tech