Which components of a galaxy move in circular patterns or revolve around a star?
Answers
Answer:
Interstellar medium is the component...
Answer:
Given below is the answer
Explanation:
American astronomer Harlow Shapley determined the galaxy's size for the first time with accuracy in 1917. He established the spatial distribution of globular clusters to determine its size. Shapley discovered that, contrary to what had previously been believed, the Galaxy is enormous and that the Sun is actually closer to the outside than the centre. He calculated that the Galaxy has a diameter of around 100,000 light-years and that the Sun is located roughly 30,000 light-years from its centre, assuming that the globular clusters surround the Galaxy. (A light-year is the average distance that light travels in a year, or 5,880,000,000,000 miles, or 9,460,000,000,000 kilometres.) His principles have stood the test of time quite well. Depending in part on the particular component being discussed, the stellar disk of the Milky Way system is just about as large as Shapley’s model predicted, with neutral hydrogen somewhat more widely dispersed and dark (i.e., unobservable) matter perhaps filling an even larger volume than expected. The most-distant stars and gas clouds of the system that have had their distance reliably determined lie roughly 100,000 light-years from the galactic centre, while the distance of the Sun from the centre has been found to be approximately 25,000 light-years.
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