M33 Triangulum Galaxy : A study of the Triangulum Galaxy (M33). Explaining the difference between visual and surface brightness in astrophotography. Analysis of the giant star-forming region NGC 604 and the specifics of late-type spiral galaxies.
M42 Orion Nebula – A study of the Orion Nebula (M42) based on two images. Analysis of deep dust structures contrasting with the bright core (Trapezium Cluster). Discussion of HDR technique and hydrogen detection (H-alpha) differences.
Aurora Borealis – A complete guide to the phenomenon. Physical analysis of atmospheric color generation, solar wind impact, and a photo gallery from Iceland documenting various auroral forms.
is a face-on spiral galaxy distanced 21 million light-years (six megaparsecs) away from Earth in the constellation Ursa Major. M101 is a large galaxy, with a diameter of 170,000 light-years. By comparison, the Milky Way has a diameter of 100,000 light years. It has around a trillion stars, twice the number in the Milky Way.
Also known as Caldwell 14 or open clusters NGC 869 and NGC 884, ( often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus. Both visible with the naked eye, NGC 869 and NGC 884 lie at a distance of 7,500 light years.
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