It's about to get a whole lot bigger
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Zefram: Is that Earth?
La Forge: That's it.
Zefram: It's so small.
Riker: It's about to get a whole lot bigger.

Riker, LaForge and Zefram have made humanity's first warp speed test flight. Zefram not sure, asks if what he is seeing is Earth, which La Forge confirms. When Zefram exclaims its so small, Riker retorts that it is about to get bigger as they move towards it.