These images are some of the first to be taken during Spitzer's warm mission -- a new phase that began after the telescope, which operated for more than five-and-a-half years, ran out of liquid coolant. Image credit: NASA/JPL-Caltech
NASA's Spitzer Space Telescope is starting a second career and taking its first shots of the cosmos since warming up.
The infrared telescope ran out of coolant May 15, 2009, more than five-and-a-half-years after launch. It has since warmed to a still-frosty 30 degrees Kelvin (about minus 406 degrees Fahrenheit).
New images taken with two of Spitzer's infrared detector channels -- two that work at the new, warmer temperature -- demonstrate the observatory remains a powerful tool for probing the dusty universe. The images show a bustling star-forming region, the remains of a star similar to the sun, and a swirling galaxy lined with stars.
"The performance of the two short wavelength channels of Spitzer's infrared array camera is essentially unchanged from what it was before the observatory's liquid helium was exhausted," said Doug Hudgins, the Spitzer program scientist at NASA Headquarters in Washington. "To put that in perspective, that means Spitzer's sensitivity at those wavelengths is still roughly the same as a 30-meter ground-based telescope. These breathtaking images demonstrate Spitzer will continue to deliver world-class imagery and science during its warm mission."
Since its launch from Cape Canaveral, Fla., on Aug. 25, 2003, Spitzer has made many discoveries. They include planet-forming disks around stars, the composition of the material making up comets, hidden black holes, galaxies billions of light-years away and more.
Perhaps the most revolutionary and surprising Spitzer finds involve planets around other stars, called exoplanets. In 2005, Spitzer detected the first photons of light from an exoplanet. In a clever technique, now referred to as the secondary-eclipse method, Spitzer was able to collect the light of a hot, gaseous exoplanet and learn about its temperature. Later detailed studies revealed more about the composition and structure of the atmospheres of these exotic worlds.
Warm Spitzer will address many of the same science questions as before. It also will tackle new projects, such as refining estimates of Hubble's constant, or the rate at which our universe is stretching apart; searching for galaxies at the edge of the universe; characterizing more than 700 near-Earth objects, or asteroids and comets with orbits that pass close to our planet; and studying the atmospheres of giant gas planets expected to be discovered soon by NASA's Kepler mission.
Spitzer officially began its warm science mission on July 27, 2009. The new pictures were taken while the telescope was being re-commissioned on July 18 (NGC 4145, NGC 4361) and July 21 (Cygnus).