NASA's Voyager 1 spacecraft is continuing its journey despite the freezing work conditions. In order to save power, one of the heaters onboard was switched off in December 2011, meaning that the ultraviolet spectrometer is now working at around minus 79 degrees Celsius. In fact it is likely that the temperature of the spectrometer is even lower than this, but the temperature gauge doesn’t go below this temperature. The spectrometer was originally designed to work down minus 35 degrees Celsius but has exceeded expectations by functioning at minus 56 degrees Celsius since 2005. The heater has been shut off in order to save power and ensure that the craft can continue to transmit data until at least 2025.