关于这张图
This image from NASA's Spitzer Space Telescope shows the Tarantula Nebula in two wavelengths of infrared light, each represented by a different color. The red color at the heart of the nebula shows the presence of particularly hot gas emitting infrared light at a wavelength of 4.5 micrometers. The blue regions are dust composed of molecules called polycyclic aromatic hydrocarbons (PAHs), which are also found in ash from coal, wood and oil fires on Earth. Regions emitting both wavelengths appear white. https://photojournal.jpl.nasa.gov/catalog/PIA23646
