You can breathe again, space fans -- NASA has returned the Kepler space telescope to normal after a nerve-wracking weekend spent in an emergency mode. It's still not clear what triggered the crisis (a planned maneuver wasn't at fault), but the team plans to double-check systems for the next week before carrying on with its extended mission. Let's just hope this doesn't happen again. Kepler barely managed to survive its first big incident, and there's no guarantee that it'll be so lucky the third time around.