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Exactly: "
We can see the major 'outline' of it (the band you mention), yes". And so could our ancestors and possibly even clearer without any modern pollution in the atmosphere.
In Norse Mythology of the creation, we have three main world dimension. We have Midgaard in where humans live. We have Asgaard where the celestial gods, godesses and animals live. An we have Utgaard where huge giants human and animals lives, in the Norse Mythology, called "Joetuns".
The "Midgaard Serpent" is said to encircle Midgaard. This myth can of course be interpreted horizontally as "a snake surrounding a local village", which indeed demands a really large snake, and interpreted vertically as a scenario on the night Sky over the Earth covering the entire Sky,
This Midgaard Serpent resembles the grey/white band of the Milky Way and our ancestors imagined this band to continue under the horizons, down in the "Underworld". So our ancestors did observe the Milky Way band over the entire night Sky and they made all kinds of mythical tellings and symbolism out of this sight/observation and as this Milky Way band was/is the largest structure in the night Sky, our ancestors - all over the world - gave giant-descriptions with human-like and animal beings and even of anthropomorphic "beings" and symbols.
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The white and observable contours of the Milky Way on the northern hemisphere, resembling a prime god in many cultures.
Again: Ancient Myths of Creation are not "just myths", but astronomical descriptions of real observations in the Sky