JULIAN BAUM / SCIENCE PHOTO LIBRARY JULIAN BAUM / SCIENCE PHOTO LIBRARY
Artwork of our galaxy, the Milky Way. The position within the galaxy of some well known objects is also shown: supernova remnants with their peculiar objects (black holes and neutron stars) SS433, M1, Tycho, Vela and G109.1-1.0; starbirth regions W3 and Orion; a young powerful star, Eta Carinae, and the Pleiades, a cluster of newly-born stars. The Milky Way contains at least 100 billion stars and may be divided into three regions: the central bulge (white-yellow at centre), the disc with the spiral arms and the galactic halo (not shown). The central bulge is populated by old stars whereas the disc contains young stars and a higher density of open star clusters and interstellar gas.
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