article_snippet.sent: A robot has stalled just three hours into the mission.
article_snippet.sent: A second robot mission scheduled for Monday was postponed as engineers investigated the cause of malfunction.
article_snippet.sent: But A robot stalled before A robot could complete its operation and had to be abandoned.
article_snippet.sent: A second robot mission scheduled for Monday was postponed as engineers investigated the cause of the malfunction .
highlights_snippet.sent: But A robot stalled within three hours of the mission and has to be abandoned .