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| courses:phy100:8 [2023/11/28 23:52] – [1. Milky Way] asad | courses:phy100:8 [2023/11/29 00:02] (current) – asad | ||
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| ===== - Milky Way ===== | ===== - Milky Way ===== | ||
| + | ==== - Our view of the Galaxy ==== | ||
| We are inside the disc of this galaxy, so we cannot see it from outside. But we can see different parts of the disk during different months of a year. | We are inside the disc of this galaxy, so we cannot see it from outside. But we can see different parts of the disk during different months of a year. | ||
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| How did we first realize that we are not at the center of our galaxy? In 1917, Harlow Shapley located a lot of globular clusters (tightly bound clusters of thousands of stars). And he saw that the globular clusters are distributed in a halo around a point which is almost 25,000 light years away from us. You can see the positions of these clusters in the side view below. | How did we first realize that we are not at the center of our galaxy? In 1917, Harlow Shapley located a lot of globular clusters (tightly bound clusters of thousands of stars). And he saw that the globular clusters are distributed in a halo around a point which is almost 25,000 light years away from us. You can see the positions of these clusters in the side view below. | ||
| + | ==== - Structure of the Galaxy ==== | ||
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courses/phy100/8.1701240777.txt.gz · Last modified: 2023/11/28 23:52 by asad