Ad Astra 1997 Robert Zubrin - Abstracts
| Ad Astra 1997 Robert Zubrin | |||||
| Title | Subject | Authors | |||
|---|---|---|---|---|---|
| Hale-Bopp and environmental control.(threat of heavenly objects)(Column) | Astronomy | Robert Zubrin | |||
| Humans to Mars: time to start phase A.(Editorial) | Astronomy | Robert Zubrin | |||
| The universe presents its challenge. | Astronomy | Robert Zubrin | |||
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