7/30/2023 0 Comments Spiral galaxy labeled![]() Through astrophotography, we can reveal much more of the galaxy structure, including the outer arms containing bright nebula regions. To the unaided eye, this spiral galaxy appears as a smudge of light in the Andromeda constellation. Other than the Large and Small Magellanic clouds that are only visible from the southern hemisphere, the Andromeda Galaxy is the brightest galaxy you can see with your naked eye. One of the best spiral galaxy examples in the Andromeda Galaxy. There are many beautiful examples of spiral galaxies in the night sky. Galaxy Type Chart (Tuning-fork-style diagram of the Hubble sequence) (Wikipedia) ![]() This more specific notation is the letters ‘a’, ‘b’, ‘c’, ‘d’, and so on where ‘a’ represents the tightest spiral. For both spiral and barred spiral galaxies, after the initial notation of the broad classification, there is a more specific classification noting the tightness of the spiral. Regular or standard spiral galaxies are typically notated as S or SA. Typically, the new stars form at the “arms” of the disk, however, when this type of galaxy does not have arms it is referred to as lenticular, or S0. Similarly to the bulge, the halo is comprised of clusters of old stars which are known as globular clusters. ![]() The halo is located on the outer edge of the galaxy. The disk component is both the shape of the galaxy and where new stars form in the galaxy. It is spherically shaped, and only contains old stars. The bulge is housed at the center of the galaxy. These types of galaxies are classified by their 3 main components – a disk, bulge, and halo. Of all the known galaxies in the universe, 77% of them are classified as spiral galaxies. Named for their shape, spiral galaxies are the most common type of galaxy in the universe. The following image of the Whirlpool Galaxy is one of my favorites. To accomplish these detailed galaxy portraits, I take long-exposure images using a monochrome camera on an equatorial telescope mount. Over the years I have photographed several galaxies from my backyard using my camera and telescope. If you want to see some of the most incredible galaxy photos ever taken, be sure to visit the Hubble Space Telescope Image Archives: Galaxies. This shape classification of galaxies was created by Edwin Hubble in 1926 which he laid out in a diagram called the Hubble Tuning Fork, because of the diagram’s resemblance in shape to a tuning fork. The other general classifications of galaxies include spiral galaxies, elliptical galaxies, and irregular galaxies. Within galaxies, there are also planets, black holes, moons, comets, and dark matter.įor example, the Milky Way, the solar system in which we reside, is classified as a barred spiral galaxy because of its general spiral shape accompanied by a bar and disk of stars at the center. Although these are the four main types, there are various types of galaxies and the way in which they are classified is by their shape.Ī galaxy is a cluster of stars, gas, and dust that are kept together by the force of gravity. There are four distinct types of galaxies in the universe, elliptical, spiral, barred spiral, and irregular.
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