Another one has shut down... NASA's alien-hunter has gone dark and scientists aren't sure why NASA's alien-hunting Kepler Space Telescope has suffered another malfunction, with the spacecraft returning to sleep mode just days after it sent information from its latest campaign back to Earth. "Following a successful return of data from the last observation campaign, the Kepler team commanded the spacecraft into position to begin collecting data for its next campaign," NASA said on its website. "On Friday October 19, during a regularly scheduled spacecraft contact using NASA’s Deep Space Network, the team learned that the spacecraft had transitioned to its no-fuel-use sleep mode. The Kepler team is currently assessing the cause and evaluating possible next steps." On Oct. 15, NASA was able to download information from it latest observation campaign, Campaign 19, noting it was "monitoring the spacecraft and will provide more information when its status has been fully assessed." .