Which of the following objects is NOT normally used in current space exploration? a. space shuttles c. single use rockets b. space stations d. space probes

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a).  Space shuttles.        Yes.  NOT current.        The last space shuttle flight was in July 2011. b).  Single-use rockets.        No.  Current.        The first successful test of a re-usable booster        took place just in the last few weeks.        Currently, EVERYTHING is single-use. c).  Space stations.        No.  Current.        The International Space Station is currently operational. d).  Space probes.        No.  Current.

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