What did ancient thinkers often consider the Milky Way to be before telescopic observation?

Answer

A cloud, a celestial river, or an atmospheric feature

Ancient observers puzzled over the hazy band, often interpreting the Milky Way, or Via Lactea, as being a cloud, a celestial river, or even something within Earth's own atmosphere, separate from the stars.

What did ancient thinkers often consider the Milky Way to be before telescopic observation?
astronomytheorystarMilky Way