关于这张图
This artist's concept shows three space telescopes that observe infrared light, wavelengths slightly longer than what human eyes can see. On the right is NASA's James Webb Space Telescope. Launched in 2021, it is the largest and most powerful space observatory in history. On the left is NASA's Infrared Astronomical Satellite (IRAS), the first infrared telescope in Earth orbit, launched in 1983. In the middle is NASA's Spitzer Space Telescope, launched in 2003. The background image is from Spitzer and shows the Eagle Nebula. https://photojournal.jpl.nasa.gov/catalog/PIA25790
