Interstellar Travel
Artifacts left within the solar system by alien expeditions in the past could be grouped into the following categories: Space Laboratories: ... Radio Relay Stations: Purposea€”transmission, reception, interception, and retransmission of signals from interstellar distances; part of a ... Altematively they might indicate known sources of useful fuels and mineral deposits or hidden dumps of essential equipment.
| Title | : | Interstellar Travel |
| Author | : | John W. Macvey |
| Publisher | : | Avon Books - 1978 |
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