| 21. | Arion 1 was originally proposed as a two-stage rocket capable of achieving suborbital flight.
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| 22. | The operation here makes upper-stage rockets and turbopumps for the space shuttle's main engine.
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| 23. | SLV is a four stage rocket with all solid-propellant motors.
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| 24. | During the academic year 1961-1962, HCRS worked on two-stage rockets, and improved the design.
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| 25. | North Korea fired a multi-stage rocket over Japan last August.
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| 26. | Topics will include North Korea's firing a multi-stage rocket over Japan last August, it said.
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| 27. | It was launched from Esrange in Sweden in 2009 . It was a two-staged rocket.
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| 28. | In August, the North launched a three-stage rocket over Japan, catching American intelligence by surprise.
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| 29. | The Snoopy mission is encouraged by the 2002 re-sighting of the Apollo 12 third-stage rocket.
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| 30. | It was a 2-stage rocket, and flew 4 times.
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