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| Version 1 | Version 2 |
|---|---|
| Nasa launches rocket successfully | Nasa launches rocket successfully |
| (30 minutes later) | |
| The US space agency has launched a prototype rocket designed to replace the ageing space shuttle. | The US space agency has launched a prototype rocket designed to replace the ageing space shuttle. |
| The Ares I-X blasted off at exactly 1530 GMT to test technology crucial for the development of a manned craft that could return astronauts to the Moon. | |
| The slender, 100m-tall vehicle is the first new launcher that Nasa has built in more than three decades. | |
| However, the project's long-term future is uncertain and could conceivably be cancelled in the coming months. | |