caption: Various Types of Interstellar Matter. Antares, the brightest star in the constellation Scorpio, is at lower left in this wide-field image. It is surrounded by reddish nebulosity. To the right of Antares is the globular cluster M4. At center left a bright star is surrounded by the blue glow of a reflection nebula, and at center right another bright star is surrounded by red nebulosity. Above these two stars a dark nebula snakes its way across the image, blocking the light from behind. Finally, at top center, a bright star is surrounded by a large area of blue reflection nebulosity, criss-crossed by dark dust lanes.
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