The speed required by a satellite to remain in a circular orbit around Earth is known as:

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1. **Orbital speed** is the speed needed to stay in a circular orbit.
2. It comes from balancing gravity and circular motion: $v=\sqrt{GM/r}$.
3. **Escape velocity** is bigger: $v_e=\sqrt{2GM/r}$, used to leave Earth.
4. Terminal and relative velocities are different concepts.

FINAL_ANSWER: c

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