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What was the first portion of the Milky Way to form?

Answer 1

The center.

A supermassive black hole with a mass of 4 million Suns formed in the center of our Milky Way, which also explains why the center is denser than the outer arms. The center of our Milky Way formed first, most likely because there was more mass there and gravity worked its magic.

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Answer 2

Hazel Asher

The central bulge, a densely populated area of stars at the galaxy's center, was probably the first part of the Milky Way to form.

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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.