Artwork of the Sagittarius Arm in the Milky Way

Artwork of the Sagittarius Arm in the Milky Way

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Credit: J. BAUM & N. HENBEST/SCIENCE PHOTO LIBRARY

Caption: The Sagittarius Arm. Map of the Sagittarius spiral arm of our Milky Way galaxy. It lies between the Sun's position (bottom centre) and the centre of our galaxy (beyond top centre). It is mainly populated by molecular clouds (orange) and regions of hydrogen gas (pink) ionised by the ultraviolet radiation of nearby hot stars. Molecular clouds contain molecules and dust and are places where star formation will probably take place. Yellow filaments are clouds of neutral hydrogen; blue circles with white cores are blue giant stars. The area shown has a diameter of about 18,500 light years. The Henbest/Baum galaxy map is based on the locations of 1500 stars, nebulae & other objects.

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Keywords: astronomy, cosmology, dust cloud, galactic, galaxy, milky way, milky way artwork, milky way map, molecular cloud, sagittarius arm, science

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