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International year of astronomy - Page 2

Messier 101 - the Pinwheel Galaxy. A grand-design spiral galaxy that's estimated to be approximately 21 million light years away and 170,000 light years across, compared to the Milky Way's 250,000 light year diameter, it's estimated to be home to around one trillion stars - more than double the Milky Way. Its asymmetrical shape is due to gravitational forces from surrounding smaller galaxies, one of which is visible in the upper right of the frame, a smaller elliptical galaxy, NGC 5204. This shot is just about ten hours (118 x 300s) of total exposure taken with a ZWO ASI294MC-Pro through an Explore Scientific ED127CF at 952mm focal length.

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Messier 13 – the Great Globular Cluster in Hercules Located in the armpit of the constellation Hercules, M13 is one of the best known globular clusters in the northern hemisphere. Discovered by Edmond Halley (for whom the comet is named) in 1714 and cataloged by Charles Messier in 1764, it’s a cluster of several hundred thousand closely grouped stars. The stars are about 100 times more densely packed than in our area of the galaxy. It’s estimated to be approximately 22.2 thousand light years away, with a diameter of 145 light years. The galaxy in the upper right is NGC 6207, which is about 30 million light years away and 34,000 light years across. Globular clusters reside in the halo of a galaxy as opposed to the disk and are bound together by gravitational forces. There are about 150 known globular clusters in the Milky Way, with an estimated 20 more hidden by dust lanes. They are generally comprised of very old stars, and M13 is estimated to be 11.65 billion years old. The process in which globular clusters are created is largely unknown, but it’s hypothesized that they originate from areas of starburst activity and interactions between galaxies. There is no known active star formation in any of theses clusters, but due to the proximity of the stars collisions occur, and new stars are created. These new stars are called “blue stragglers”, some of which may be seen in the photo. The proximity of the stars (on average about one light year apart) also creates many binary star systems (think Tatooine), but due to the age and makeup of the stars there are very few with planets. This is about 3:15 hours of exposure.

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Discovered in 1781 by the French astronomer and comet hunter, Pierre Méchain, the Sombrero galaxy is a lenticular galaxy, which is a classification between full elliptical and spiral, meaning that it has a disc structure but without spiral arms. It’s about 31 million light years away in the constellation of Virgo and about 50 million light years across (one-third of the Milky Way’s diameter). Astronomers have determined that the supermassive black hole at the center of the galaxy is about 1 billion solar masses, making it one of the largest in nearby galaxies. They’ve also determined that there are between 1,200 and 2,000 globular clusters present, more than ten times the estimate for the Milky Way’s population, and they’ve been able to correlate the prevalence of globular clusters with the amount of bulge in the galaxy. Using infrared spectroscopy astronomers have also determined that the bulk of star formation occurs within the highly contrasted dust lane. This is 2:20 hours of exposure.

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Celebrating 50 years of Lunar exploration🌔

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Full - International Union For Conservation Of Nature

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long exposure photography of sky

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BaZi- The Destiny Code Bazi: The Destiny Code Revealed Xuan Kong Flying Stars Feng Shui The Ten Thousand Year Calendar (Pocket Edition) Four Pillars of Destiny - book

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Luxup 2024-11-23 02:49:32

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