Final answer:
An infrared telescope is sensitive to infrared light rays and is most efficient when launched into Earth's orbit.
Step-by-step explanation:
An infrared telescope is sensitive to infrared light rays and is most efficient when launched into Earth's orbit. Infrared telescopes are designed to detect and analyze infrared radiation, which is electromagnetic radiation with longer wavelengths than visible light. These telescopes can observe objects that emit infrared radiation, such as warm objects in space and celestial objects that are not visible in visible light.