Volunteers who use the characteristics of the project of the Milky Way's star formation nicknamed "yellowballs" web-based have attracted the attention of researchers, demonstrating that these yellow balls are in a phase of massive star formation. The yellow balls, which are several hundred thousand times the size of our solar system, are represented here in the center of this image in the region of star formation W33, taken by the Spitzer Space Telescope.
Most nebulae is widespread and that means that they are very large and do not have well-defined boundaries. In visible light, these nebulae can be divided in emission nebulae and reflection nebulae based on how you create the light we see. The emission nebulae contain ionized gas (mostly ionized hydrogen) that produces spectral lines of emission. They are often called H II regions derived from the language of the professional astronomers referring ionized hydrogen.
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The sky around the star Gliese 667C | This picture shows the sky around multiple star #Gliese667. The bright star at the centre is Gliese 667 A and B, the two main components of the system, which cannot be separated in this image.