Plausible reason for a civilization to not explore their own planet and explore space instead

A civilization of land-living humanoids occupies a patch of land on a continent (patch of land size: a few US States, let's say Montanas) and, without even exploring the continent fully, develops space travel and starts to explore space. Their home planet is similar to Earth, fully habitable, with a number of continents, oceans, etc. There are other races on the planet, some of them have civilizations, but they are much more primitive. What I need is a reason, why exactly would they not explore their own homeworld, rather choosing to expand in space?

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Plausible reason for a civilization to not explore their own planet and explore space instead

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