Celestial Valentine
Generations of stars can be seen in this infrared portrait from NASA's Spitzer Space Telescope. In this wispy star-forming region, called W5, the oldest stars can be seen as blue dots in the centers of the two hollow cavities (other blue dots are background and foreground stars not associated with the region).
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Where do the red and green colours come from? Do you know?
Red shows heated dust that pervades the region's cavities, while green highlights dense clouds.