| タイトル | Understanding other worlds: NASA's missions to find and characterize extrasolar planetary systems |
| 著者（英） | Unwin, Stephen C. |
| 発行日 | 2005-09-01 |
| 言語 | eng |
| 内容記述 | About 150 extrasolar planets, mostly much more massive the Earth, are now known from ground-based observations. Earth-mass planets are very hard, if not impossible, to detect from the ground. The study of planets like our own Earth, orbiting in a 'habitable zone' around their parent stars, will require a new generation of space-based instruments. |
| 権利 | Copyright |
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