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Yes, and many do depending on what they are for. If the probe is just being placed in earth orbit and is intended to stay if that orbit without moving then it needs no engine and won't have one. The Hubble Space Telescope is a good example. If the probe is intended to change its orbit around the earth, or if it is intended to leave earth orbit and go elswehere in the solar system, then it will need engines for that purpose and will have them.

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15y ago

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