'The little telescope that could' has retired. It changed how we see the universe
By Ashley Strickland
RIP Spitzer, the Coolest Heat Telescope in the Solar System
By Daniel Oberhaus
The Spitzer Space Telescope's greatest exoplanet discoveries of all time
By Elizabeth Howell
NASA's Spitzer Space Telescope is no more. Here's what's next for infrared astronomy.
By Meghan Bartels
Farewell, Spitzer Space Telescope! NASA shuts down prolific observatory.
By Doris Elin Urrutia