The grand green-and-orange delta filling most of the image is a faraway nebula, or a cloud of gas and dust in space. Though the cloud may appear to flow from the bright white spot at its tip, it is actually what remains of a much larger cloud that has been carved away by radiation from stars. The bright region is illuminated by massive stars, belonging to a cluster that extends above the white spot. The white color is the combination of four colors (blue, green, orange and red), each representing a different wavelength of infrared light, which is invisible to human eyes. Dust that has been heated by the stars' radiation creates the surrounding red glow.
Image Credit: NASA/JPL-Caltech
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