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How did scientists determine the shape of the Milky Way?

Answer 1

Due to dust clouds optical observation of milky way is difficult.

Later, using the Very Long Baseline Array (VLBA), a system of 10 radio telescopes spanning the globe from Hawaii to New England to the Virgin Islands, and operated in Socorro, N.M., Reid's team studied masers — naturally occurring sources of laser-like radio waves from clouds of gas near luminous stars — to map our galaxy in unprecedented detail. From space.com.news. Molecular hydrogen in the Galaxy emits radiation in 21 centimeter wave length. This was the first mapping.

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Answer 2

Levi Anderson

Trigonometric parallax and star counts played crucial roles in mapping the structure of the Milky Way, which was discovered through observations of star positions and movements, along with advances in radio astronomy and infrared observations.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.