To celebrate NASA's Spitzer Space Telescope's 16th birthday, the Hubble Space Telescope team decided to put together a special present for their fellow "observing buddy." Hubble and Spitzer have observed many of the same astronomical objects over the years; and with Spitzer getting data from infrared, and Hubble getting data from visible, ultraviolet, and some near-infrared, the two telescopes have helped uncover some of the mysteries of the universe. For more information, visit nasa.gov/hubble.

The Hubble Deep Field is one of the most extraordinary photographs ever taken. | IFLScience