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: Did Mars once host life? NASA says a false-color image taken by its Mars Exploration Rover Opportunity shows a rock dubbed  quot;Escher quot; whose fractures, which divide the surface into polygons, may have been formed when water left over from the rock #39;s formation dried up.

Sci/Tech