http://photojournal.jpl.nasa.gov/catalog/PIA19872

NASA's Spitzer Space Telescope celebrated its 12th anniversary with a new digital calendar showcasing some of the mission's most notable discoveries and popular cosmic eye candy.

The digital calendar is online at http://www.jpl.nasa.gov/images/spitzer/20150820/Spitzer12thAnniversaryCalendar.pdf

The calendar follows the life of the mission, with each month highlighting top infrared images and discoveries from successive years -- everything from a dying star resembling the eye of a monster to a star-studded, swirling galaxy. The final month includes a brand new image of the glittery star-making factory known as the Monkey Head nebula.

Spitzer, which launched into space on August 25, 2003, from Cape Canaveral, Florida, is still going strong. It continues to use its ultra-sensitive infrared vision to probe asteroids, comets, exoplanets (planets outside our solar system) and some of the farthest known galaxies. Recently, Spitzer helped discover the closest known rocky exoplanet to us, named HD219134b, at 21 light-years away.

In fact, Spitzer's exoplanet studies continue to surprise the astronomy community. The telescope wasn't originally designed to study exoplanets, but as luck -- and some creative engineering -- would have it, Spitzer has turned out to be a critical tool in the field, probing the climates and compositions of these exotic worlds. This pioneering work began in 2005, when Spitzer became the first telescope to detect light from an exoplanet.

Other top discoveries from the mission so far include:

-- Recipe for "comet soup." Spitzer observed the aftermath of the collision between NASA's Deep Impact spacecraft and comet Tempel 1, finding that cometary material in our own solar system resembles that around nearby stars.

-- The largest known ring around Saturn, a wispy, fine structure with 300 times the diameter of Saturn.

-- First exoplanet weather map of temperature variations over the surface of a gas exoplanet. Results suggested the presence of fierce winds.

-- Asteroid and planetary smashups. Spitzer has found evidence for several rocky collisions in other solar systems, including one thought to involve two large asteroids.

-- The hidden lairs of newborn stars. Spitzer's infrared images have provided unprecedented views into the hidden cradles where young stars grow up, revolutionizing our understanding of stellar birth.

-- Buckyballs in space. Buckyballs are soccer-ball-shaped carbon molecules that have important technological applications on Earth.

-- One of the most remote planets known, lying about 13,000 light-years away, deep within our galaxy. Spitzer continues to help in the search for exoplanets using a state-of-the-art method called microlensing.

-- Massive clusters of galaxies. Spitzer has identified many more distant galaxy clusters than were previously known.

-- "Big baby" galaxies. Spitzer and Hubble has found remote galaxies that were much more massive and mature than expected.

JPL manages the Spitzer Space Telescope mission for NASA's Science Mission Directorate, Washington. Science operations are conducted at the Spitzer Science Center at the California Institute of Technology in Pasadena. Spacecraft operations are based at Lockheed Martin Space Systems Company, Littleton, Colorado. Data are archived at the Infrared Science Archive housed at the Infrared Processing and Analysis Center at Caltech. Caltech manages JPL for NASA.

For more information about Spitzer, visit http://www.nasa.gov/spitzer and http://spitzer.caltech.edu.

Wikipedia links to images above (source)
Messier 81 | Crab Nebula | Galactic Center | Helix Nebula
Rho Ophiuchi cloud complex | Triangulum Galaxy | Orion Nebula | North America Nebula