Final answer:
Spitzer Space Telescope observes primarily in infrared, while Hubble Space Telescope focuses on visible and ultraviolet wavelengths. Spitzer can view cooler cosmic objects and peer through dust clouds, adding depth to space observations.
Step-by-step explanation:
The Spitzer Space Telescope is different from the Hubble Space Telescope in terms of the wavelengths they observe. Option (b) is the correct answer: Spitzer primarily observes infrared light, while Hubble focuses on visible and ultraviolet wavelengths. The Hubble Space Telescope, launched in 1990, is known for its ability to gather ultraviolet radiation as well as visible light, aiding in a broad range of astronomical studies. The Spitzer Space Telescope, which was the most powerful infrared telescope and launched in 2003, is dedicated to infrared astronomy, providing detailed views on cosmic objects such as dust clouds around star nurseries and remnants of dying stars, which are not typically visible in other light spectra. By being able to observe in infrared, Spitzer could detect objects that are cooler and can peer through dust clouds that might obscure views in the visible spectrum.