Warmed Up and Ready to Go

NASA's Spitzer Space Telescope has put its infrared eyes back on the sky to observe the cold and dusty universe. The telescope ran out of liquid coolant on May 15, 2009, after more than five-and-a-half years of observations. Two of its infrared channels are working at full capacity at the observatory's new "warm" temperature of approximately 30 Kelvin (minus 406 degrees Fahrenheit) -- still quite