How do we know our galaxy is a flat disk?

Answer 1

Due to dust and gases in the milky way it is not easy to see or photograph in visible ,light.

With the use of a radio telescope, we can determine the form of the radiation that the Milky Way's molecular hydrogen emits at 21 centimeters.

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Answer 2

Layla Anderson

Our understanding of the Milky Way's flat disk shape comes from observations of its structure and the distribution of stars within it, as well as measurements of their motions. Astronomers use techniques such as stellar parallax, star counts, and measurements of the rotation curve to infer the flattened shape of our galaxy. Additionally, studies of other spiral galaxies support the idea that they typically have disk-like shapes.

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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.