Galaxy Bima Sakti
3:26 AM Posted by Technology
Galaxy is a gathering place of the stars in the universe. Almost does not find any stars that wander alone in the space between the galaxy. And Sun among 200 billion stars in the Milky Way galaxy (abbreviated to the galaxy). With the assumption that the average mass stars in the galaxy mass is equal to Sun, the galaxy mass can reach 2 x 10 ^ 11 Mass Sun (Sun mass is 2 x 10 ^ 30 kg).
Such as the Milky Way galaxy form the two plates are concave ditangkupkan, the thick middle and thin toward the edge, and there are spiral arms in it. Therefore, our galaxy is classified into the spiral galaxy. Based on the Hubble galaxy classification, including the Milky Way galaxy in the class SBbc. That is, our galaxy is a spiral galaxy that has a "bar" or the crossbar in the center, with kecerlangan central part is relatively the same as the disc, and have a spiral arm structure that is rather thin on the plate.
Such as the Milky Way galaxy form the two plates are concave ditangkupkan, the thick middle and thin toward the edge, and there are spiral arms in it. Therefore, our galaxy is classified into the spiral galaxy. Based on the Hubble galaxy classification, including the Milky Way galaxy in the class SBbc. That is, our galaxy is a spiral galaxy that has a "bar" or the crossbar in the center, with kecerlangan central part is relatively the same as the disc, and have a spiral arm structure that is rather thin on the plate.
Spiral galaxy composed of 3 main parts, namely the bulge, halo, and disk. They have the shape, size, and the item composer different. In fact, part of the disc bulge and a determination in the galaxy classifications made by the Hubble (tune fork diagram).
The bulge is a region in the galaxy's most high-density bintangnya. Star-old found more than young stars, because very little material forming stars that are here. Bulge is elipsoid shaped like rugby balls. The stars in it is moving at high speed and a random orbit, not sebidang with field galaxy. Calculation speed of orbit of the stars in it, the conclusion is that there is a very large object bermassa which is located in the center of a galaxy far greater than previous estimates. Objects believed was a black hole supermasif, who estimated there are at the center of all spiral galaxy. Included also in the Andromeda galaxy, the nearest spiral galaxy of our galaxy.
Second component is the halo. Spheroid, the size of this component is very large and far away cover bulge and disc, may be even more than the limit terluar disk galaxy that we can observe. Objects which become editor halo is divided into two groups, namely Stellar halo and dark halo. Stellar is the halo stars are located in the halo. But found only a few individual stars in this section. The more dominant groups are the stars of old members, the number of stars to reach millions of units, called the cluster with the ball (globular cluster).
At the plate there are young stars and gas and dust between stars, located in the spiral arms. Finding many young stars and interstellar gas is very closely related, because the gas is the primary material forming stars. In some even found the location of the stars who are still covered gas, which indicates that the stars are the new form. While many in the dust disc in the observer makes it difficult to perform Earth observation in the visual field around galaxy, especially toward the galaxy center (see picture above). Therefore, the observation in the field around the galaxy will provide better results if done in the area of long radio waves and infra red is not affected by interstellar dust (see picture below).
The bulge is a region in the galaxy's most high-density bintangnya. Star-old found more than young stars, because very little material forming stars that are here. Bulge is elipsoid shaped like rugby balls. The stars in it is moving at high speed and a random orbit, not sebidang with field galaxy. Calculation speed of orbit of the stars in it, the conclusion is that there is a very large object bermassa which is located in the center of a galaxy far greater than previous estimates. Objects believed was a black hole supermasif, who estimated there are at the center of all spiral galaxy. Included also in the Andromeda galaxy, the nearest spiral galaxy of our galaxy.
Second component is the halo. Spheroid, the size of this component is very large and far away cover bulge and disc, may be even more than the limit terluar disk galaxy that we can observe. Objects which become editor halo is divided into two groups, namely Stellar halo and dark halo. Stellar is the halo stars are located in the halo. But found only a few individual stars in this section. The more dominant groups are the stars of old members, the number of stars to reach millions of units, called the cluster with the ball (globular cluster).
At the plate there are young stars and gas and dust between stars, located in the spiral arms. Finding many young stars and interstellar gas is very closely related, because the gas is the primary material forming stars. In some even found the location of the stars who are still covered gas, which indicates that the stars are the new form. While many in the dust disc in the observer makes it difficult to perform Earth observation in the visual field around galaxy, especially toward the galaxy center (see picture above). Therefore, the observation in the field around the galaxy will provide better results if done in the area of long radio waves and infra red is not affected by interstellar dust (see picture below).
How big our galaxy? At the center of galaxy, bulge has a diameter of only 6 and thick 4 KPC KPC (KPC = kiloparsek, 1 parsek = 3.26 light years = 206,265 SA = 3.086 x 10 ^ 13 km). The distance from the central to the galaxy to the edge (fingers) is 15 KPC with an average thickness of 300 pc. Meanwhile, Sun is on the distance from the center of KPC 8. In position, the Sun are still beset with the central galaxy of a nearly circular orbit. Orbitnya rate is around 250 km / sec so that the sun takes 220 million years to around one time. If the age of the sun is 4.6 billion years, the solar system we have mengorbit the central galaxy as much as 20 times.
Our galaxy is actually located in a galaxy group which is called the Local Group, which reach the size 1 and MPC has more than 30 galaxy. Spiral galaxy in the group is only three, the Milky Way, Andromeda, and Triangulum. The rest is a galaxy with a smaller form of ellipse or not uniform. Local Group galaxy include the group dynamic. The meaning is that the galaxy-galaxy in this group experienced gravity interaction, including our galaxy with the Andromeda galaxy. Interaction is estimated to result in the occurrence of collision between our galaxy and the Andromeda galaxy and the ellipse shape. But do not worry because the events will not occur up to 2 billion years.
duniaastronomi.com
Our galaxy is actually located in a galaxy group which is called the Local Group, which reach the size 1 and MPC has more than 30 galaxy. Spiral galaxy in the group is only three, the Milky Way, Andromeda, and Triangulum. The rest is a galaxy with a smaller form of ellipse or not uniform. Local Group galaxy include the group dynamic. The meaning is that the galaxy-galaxy in this group experienced gravity interaction, including our galaxy with the Andromeda galaxy. Interaction is estimated to result in the occurrence of collision between our galaxy and the Andromeda galaxy and the ellipse shape. But do not worry because the events will not occur up to 2 billion years.
duniaastronomi.com
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