Map showing the Sagittarius Arm in the Milky Way

Map showing 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 is mainly populated by molecular clouds (orange) and regions of hydrogen gas (pink) ionised by the ultraviolet radiation of nearby hot stars. The molecular clouds, containing molecules and dust, are places where star formation will probably take place. Yellow filaments mark the positions of neutral hydrogen. Some pulsars are seen here; they are fast-spinning neutron stars characterised by a strong magnetic field. The area shown has a diameter of about 18,500 light years. The Henbest/ Baum galaxy map is based on the location of 1500 bright stars, nebulae and other objects.

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

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