Whirlpool Galaxy (M51) - Infrared View from Spitzer Space Telescope #2223205 (License: Personal Use)

This infrared composite image of the Whirlpool Galaxy (Messier 51) combines data from Spitzer’s IRAC instrument, where blue represents 3.6 µm emission from older stars, green shows 8 µm polycyclic aromatic hydrocarbons, and red traces 24 µm warm dust. The galaxy’s grand-design spiral structure is enhanced by interactions with its companion galaxy NGC 5195, triggering intense star formation visible as bright knots along the arms. Background stars and distant galaxies dot the deep-space field.

Used on astronomy, space science, and educational websites to illustrate galaxy morphology, star formation, and infrared astronomy; matches user intent for learning about M51, telescope capabilities, or high-resolution space imagery.