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The singular "star" rather than "stars" is a specific choice — not the general astronomical field but one particular star, a destination rather than a direction. A gateway to a specific star is a different proposition from a gateway to space in general: it implies that the star has something worth arriving at, that it's a place rather than just a light source. What that might mean in practice — a civilisation, a phenomenon, a source of something — the image leaves open, but the gateway makes it reachable by suggesting that someone, at some point, decided it was worth pointing a door at.