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A ♣ Milky Way, Our Galaxy © Jon Lomberg / Galaxy Garden Our Galaxy Distance from the Sun to the Galactic Center: 25,000 light years We live in the disk of the Milky Way Galaxy which has a diameter of about 100,000 light years. The Galaxy Garden in Kona is an outdoor scale model of the Milky Way, mapped in living plants and flowers and based on current astrophysical data. It is 100 feet (30 meters) in diameter. ♣ www.galaxygarden.net A 2 ♣ IC 10 Keck © UC Berkeley /NASA /W. M. Keck Observatory Galaxy Infrared Image Distance from the Sun: 2,600,000 light years Not all galaxies look pretty and symmetric. When they do not, astronomers use the term “irregular" to describe them. IC 10 is one such galaxy. Astronomers study it in order to understand how stars evolve. IC 10 is also a member of a cluster of galaxies called the Local Group, which includes the Milky Way and Andromeda Galaxies. ♣ 2 www.keckobservatory.org 3 ♣ Subaru NGC 2403 © Subaru Telescope, NAOJ Galaxy Visible Image Distance from the Sun: 10,000,000 light years 3 subarutelescope.org ♣ MGC 2403 is a spiral galaxy whose mass is about half of our Milky Way Galaxy. In the spiral arms we see active star-forming regions in pink, clusters of young stars in blue, and gas and dust within the galaxy in dark regions. 4 ♣ VLBA Supernova 1993J © NRAO / AUI and N. Bartel, M. Bietenholz, M. Rupen, et al. Supernova Radio Image Distance from the Sun: 11,000,000 light years 4 www.vlba.nrao.edu ♣ Supernova 1993J located in M81 galaxy was discovered March 28, 1993, by an amateur astronomer in Spain. Astronomers observed the supernova from May 17, 1993 (top-left) to February 25, 2000 (bottom-right). We can see a shell-like radio structure which has expanded for seven years with circular symmetry.